prism_compile.c (ad23fd4a519fde4fc96c7326fb9b0347cbc347b8)

#include "prism.h"
#include "ruby/version.h"
 
#include <fcntl.h>
 
typedef struct {
    int32_t line;
 
    uint32_t node_id;
} pm_node_location_t;
 
/******************************************************************************/
/* These macros operate on pm_node_location_t structs as opposed to NODE*s.   */
/******************************************************************************/
 
#define PUSH_ADJUST(seq, location, label) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_adjust_body(iseq, (label), (int) (location).line))
 
#define PUSH_ADJUST_RESTORE(seq, label) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_adjust_body(iseq, (label), -1))
 
#define PUSH_INSN(seq, location, insn) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (int) (location).line, (int) (location).node_id, BIN(insn), 0))
 
#define PUSH_INSN1(seq, location, insn, op1) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (int) (location).line, (int) (location).node_id, BIN(insn), 1, (VALUE)(op1)))
 
#define PUSH_INSN2(seq, location, insn, op1, op2) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (int) (location).line, (int) (location).node_id, BIN(insn), 2, (VALUE)(op1), (VALUE)(op2)))
 
#define PUSH_INSN3(seq, location, insn, op1, op2, op3) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (int) (location).line, (int) (location).node_id, BIN(insn), 3, (VALUE)(op1), (VALUE)(op2), (VALUE)(op3)))
 
#define PUSH_INSNL(seq, location, insn, label) \
    (PUSH_INSN1(seq, location, insn, label), LABEL_REF(label))
 
#define PUSH_LABEL(seq, label) \
    ADD_ELEM((seq), (LINK_ELEMENT *) (label))
 
#define PUSH_SEND_R(seq, location, id, argc, block, flag, keywords) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_send(iseq, (int) (location).line, (int) (location).node_id, (id), (VALUE)(argc), (block), (VALUE)(flag), (keywords)))
 
#define PUSH_SEND(seq, location, id, argc) \
    PUSH_SEND_R((seq), location, (id), (argc), NULL, (VALUE)INT2FIX(0), NULL)
 
#define PUSH_SEND_WITH_FLAG(seq, location, id, argc, flag) \
    PUSH_SEND_R((seq), location, (id), (argc), NULL, (VALUE)(flag), NULL)
 
#define PUSH_SEND_WITH_BLOCK(seq, location, id, argc, block) \
    PUSH_SEND_R((seq), location, (id), (argc), (block), (VALUE)INT2FIX(0), NULL)
 
#define PUSH_CALL(seq, location, id, argc) \
    PUSH_SEND_R((seq), location, (id), (argc), NULL, (VALUE)INT2FIX(VM_CALL_FCALL), NULL)
 
#define PUSH_CALL_WITH_BLOCK(seq, location, id, argc, block) \
    PUSH_SEND_R((seq), location, (id), (argc), (block), (VALUE)INT2FIX(VM_CALL_FCALL), NULL)
 
#define PUSH_TRACE(seq, event) \
    ADD_ELEM((seq), (LINK_ELEMENT *) new_trace_body(iseq, (event), 0))
 
#define PUSH_CATCH_ENTRY(type, ls, le, iseqv, lc) \
    ADD_CATCH_ENTRY((type), (ls), (le), (iseqv), (lc))
 
#define PUSH_SEQ(seq1, seq2) \
    APPEND_LIST((seq1), (seq2))
 
#define PUSH_SYNTHETIC_PUTNIL(seq, iseq) \
    do { \
        int lineno = ISEQ_COMPILE_DATA(iseq)->last_line; \
        if (lineno == 0) lineno = FIX2INT(rb_iseq_first_lineno(iseq)); \
        ADD_SYNTHETIC_INSN(seq, lineno, -1, putnil); \
    } while (0)
 
/******************************************************************************/
/* These functions compile getlocal/setlocal instructions but operate on      */
/* prism locations instead of NODEs.                                          */
/******************************************************************************/
 
static void
pm_iseq_add_getlocal(rb_iseq_t *iseq, LINK_ANCHOR *const seq, int line, int node_id, int idx, int level)
{
    if (iseq_local_block_param_p(iseq, idx, level)) {
        ADD_ELEM(seq, (LINK_ELEMENT *) new_insn_body(iseq, line, node_id, BIN(getblockparam), 2, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level)));
    }
    else {
        ADD_ELEM(seq, (LINK_ELEMENT *) new_insn_body(iseq, line, node_id, BIN(getlocal), 2, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level)));
    }
    if (level > 0) access_outer_variables(iseq, level, iseq_lvar_id(iseq, idx, level), Qfalse);
}
 
static void
pm_iseq_add_setlocal(rb_iseq_t *iseq, LINK_ANCHOR *const seq, int line, int node_id, int idx, int level)
{
    if (iseq_local_block_param_p(iseq, idx, level)) {
        ADD_ELEM(seq, (LINK_ELEMENT *) new_insn_body(iseq, line, node_id, BIN(setblockparam), 2, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level)));
    }
    else {
        ADD_ELEM(seq, (LINK_ELEMENT *) new_insn_body(iseq, line, node_id, BIN(setlocal), 2, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level)));
    }
    update_lvar_state(iseq, level, idx);
    if (level > 0) access_outer_variables(iseq, level, iseq_lvar_id(iseq, idx, level), Qtrue);
}
 
#define PUSH_GETLOCAL(seq, location, idx, level) \
    pm_iseq_add_getlocal(iseq, (seq), (int) (location).line, (int) (location).node_id, (idx), (level))
 
#define PUSH_SETLOCAL(seq, location, idx, level) \
    pm_iseq_add_setlocal(iseq, (seq), (int) (location).line, (int) (location).node_id, (idx), (level))
 
/******************************************************************************/
/* These are helper macros for the compiler.                                  */
/******************************************************************************/
 
#define OLD_ISEQ NEW_ISEQ
#undef NEW_ISEQ
 
#define NEW_ISEQ(node, name, type, line_no) \
    pm_new_child_iseq(iseq, (node), rb_fstring(name), 0, (type), (line_no))
 
#define OLD_CHILD_ISEQ NEW_CHILD_ISEQ
#undef NEW_CHILD_ISEQ
 
#define NEW_CHILD_ISEQ(node, name, type, line_no) \
    pm_new_child_iseq(iseq, (node), rb_fstring(name), iseq, (type), (line_no))
 
#define PM_COMPILE(node) \
    pm_compile_node(iseq, (node), ret, popped, scope_node)
 
#define PM_COMPILE_INTO_ANCHOR(_ret, node) \
    pm_compile_node(iseq, (node), _ret, popped, scope_node)
 
#define PM_COMPILE_POPPED(node) \
    pm_compile_node(iseq, (node), ret, true, scope_node)
 
#define PM_COMPILE_NOT_POPPED(node) \
    pm_compile_node(iseq, (node), ret, false, scope_node)
 
// Direct-indexed lookup table. -1 means "not present".
#define PM_INDEX_LOOKUP_TABLE_INIT { .values = NULL, .capacity = 0, .owned = false }
 
static inline void
pm_index_lookup_table_init(pm_index_lookup_table_t *table, int constants_size, rb_iseq_t *iseq)
{
    int capacity = constants_size + PM_INDEX_LOOKUP_SPECIALS;
    table->values = compile_data_alloc2_type(iseq, int, capacity);
    memset(table->values, -1, capacity * sizeof(int));
    table->capacity = capacity;
    table->owned = false;
}
 
static inline pm_line_column_t
pm_line_offset_list_line_column_cached(const pm_line_offset_list_t *list, uint32_t cursor, int32_t start_line, size_t *last_line)
{
    size_t hint = *last_line;
    size_t size = list->size;
    const uint32_t *offsets = list->offsets;
 
    RUBY_ASSERT(hint < size);
 
    /* Check if the cursor is on the same line as the hint. */
    if (offsets[hint] <= cursor) {
        if (hint + 1 >= size || offsets[hint + 1] > cursor) {
            *last_line = hint;
            return ((pm_line_column_t) {
                .line = ((int32_t) hint) + start_line,
                .column = cursor - offsets[hint]
            });
        }
 
        /* Linear scan forward (up to 8 lines before giving up). */
        size_t limit = hint + 9;
        if (limit > size) limit = size;
        for (size_t idx = hint + 1; idx < limit; idx++) {
            if (offsets[idx] > cursor) {
                *last_line = idx - 1;
                return ((pm_line_column_t) {
                    .line = ((int32_t) (idx - 1)) + start_line,
                    .column = cursor - offsets[idx - 1]
                });
            }
            if (offsets[idx] == cursor) {
                *last_line = idx;
                return ((pm_line_column_t) { ((int32_t) idx) + start_line, 0 });
            }
        }
    }
    else {
        /* Linear scan backward (up to 8 lines before giving up). */
        size_t limit = hint > 8 ? hint - 8 : 0;
        for (size_t idx = hint; idx > limit; idx--) {
            if (offsets[idx - 1] <= cursor) {
                *last_line = idx - 1;
                return ((pm_line_column_t) {
                    .line = ((int32_t) (idx - 1)) + start_line,
                    .column = cursor - offsets[idx - 1]
                });
            }
        }
    }
 
    /* Fall back to binary search. */
    pm_line_column_t result = pm_line_offset_list_line_column(list, cursor, start_line);
    *last_line = (size_t) (result.line - start_line);
    return result;
}
 
static inline int32_t
pm_line_offset_list_line_cached(const pm_line_offset_list_t *list, uint32_t cursor, int32_t start_line, size_t *last_line)
{
    return pm_line_offset_list_line_column_cached(list, cursor, start_line, last_line).line;
}
 
#define PM_NODE_START_LOCATION(node) \
    ((pm_node_location_t) { .line = pm_line_offset_list_line_cached(scope_node->line_offsets, ((const pm_node_t *) (node))->location.start, scope_node->start_line, &scope_node->last_line), .node_id = ((const pm_node_t *) (node))->node_id })
 
#define PM_NODE_END_LOCATION(node) \
    ((pm_node_location_t) { .line = pm_line_offset_list_line_cached(scope_node->line_offsets, ((const pm_node_t *) (node))->location.start + ((const pm_node_t *) (node))->location.length, scope_node->start_line, &scope_node->last_line), .node_id = ((const pm_node_t *) (node))->node_id })
 
#define PM_LOCATION_START_LOCATION(location, id) \
    ((pm_node_location_t) { .line = pm_line_offset_list_line_cached(scope_node->line_offsets, (location)->start, scope_node->start_line, &scope_node->last_line), .node_id = id })
 
#define PM_NODE_START_LINE_COLUMN(node) \
    pm_line_offset_list_line_column_cached(scope_node->line_offsets, ((const pm_node_t *) (node))->location.start, scope_node->start_line, &scope_node->last_line)
 
#define PM_NODE_END_LINE_COLUMN(node) \
    pm_line_offset_list_line_column_cached(scope_node->line_offsets, ((const pm_node_t *) (node))->location.start + ((const pm_node_t *) (node))->location.length, scope_node->start_line, &scope_node->last_line)
 
#define PM_LOCATION_START_LINE_COLUMN(location) \
    pm_line_offset_list_line_column_cached(scope_node->line_offsets, (location)->start, scope_node->start_line, &scope_node->last_line)
 
static int
pm_location_line_number(const pm_parser_t *parser, const pm_location_t *location) {
    return (int) pm_line_offset_list_line_column(pm_parser_line_offsets(parser), location->start, pm_parser_start_line(parser)).line;
}
 
static inline int
pm_node_line_number_cached(const pm_node_t *node, pm_scope_node_t *scope_node)
{
    return (int) pm_line_offset_list_line_cached(scope_node->line_offsets, node->location.start, scope_node->start_line, &scope_node->last_line);
}
 
static inline int
pm_location_line_number_cached(const pm_location_t *location, pm_scope_node_t *scope_node) {
    return (int) pm_line_offset_list_line_cached(scope_node->line_offsets, location->start, scope_node->start_line, &scope_node->last_line);
}
 
static VALUE
parse_integer_value(const pm_integer_t *integer)
{
    VALUE result;
 
    if (integer->values == NULL) {
        result = UINT2NUM(integer->value);
    }
    else {
        // The pm_integer_t stores values as an array of uint32_t in
        // least-significant-word-first order (base 2^32). We can convert
        // directly to a Ruby Integer using rb_integer_unpack, avoiding the
        // overhead of constructing a hex string and calling rb_funcall.
        result = rb_integer_unpack(
            integer->values,
            integer->length,
            sizeof(uint32_t),
            0,
            INTEGER_PACK_LSWORD_FIRST | INTEGER_PACK_NATIVE_BYTE_ORDER
        );
    }
 
    if (integer->negative) {
        result = rb_int_uminus(result);
    }
 
    if (!SPECIAL_CONST_P(result)) {
        RB_OBJ_SET_SHAREABLE(result); // bignum
    }
 
    return result;
}
 
static inline VALUE
parse_integer(const pm_integer_node_t *node)
{
    return parse_integer_value(&node->value);
}
 
static VALUE
parse_float(const pm_float_node_t *node)
{
    VALUE val = DBL2NUM(node->value);
    if (!FLONUM_P(val)) {
        RB_OBJ_SET_SHAREABLE(val);
    }
    return val;
}
 
static VALUE
parse_rational(const pm_rational_node_t *node)
{
    VALUE numerator = parse_integer_value(&node->numerator);
    VALUE denominator = parse_integer_value(&node->denominator);
 
    return rb_ractor_make_shareable(rb_rational_new(numerator, denominator));
}
 
static VALUE
parse_imaginary(const pm_imaginary_node_t *node)
{
    VALUE imaginary_part;
    switch (PM_NODE_TYPE(node->numeric)) {
      case PM_FLOAT_NODE: {
        imaginary_part = parse_float((const pm_float_node_t *) node->numeric);
        break;
      }
      case PM_INTEGER_NODE: {
        imaginary_part = parse_integer((const pm_integer_node_t *) node->numeric);
        break;
      }
      case PM_RATIONAL_NODE: {
        imaginary_part = parse_rational((const pm_rational_node_t *) node->numeric);
        break;
      }
      default:
        rb_bug("Unexpected numeric type on imaginary number %s\n", pm_node_type(PM_NODE_TYPE(node->numeric)));
    }
 
    return RB_OBJ_SET_SHAREABLE(rb_complex_raw(INT2FIX(0), imaginary_part));
}
 
static inline VALUE
parse_string(const pm_scope_node_t *scope_node, const pm_string_t *string)
{
    return rb_enc_str_new((const char *) pm_string_source(string), pm_string_length(string), scope_node->encoding);
}
 
static inline VALUE
parse_string_encoded(const pm_node_t *node, const pm_string_t *string, rb_encoding *default_encoding)
{
    rb_encoding *encoding;
 
    if (node->flags & PM_ENCODING_FLAGS_FORCED_BINARY_ENCODING) {
        encoding = rb_ascii8bit_encoding();
    }
    else if (node->flags & PM_ENCODING_FLAGS_FORCED_UTF8_ENCODING) {
        encoding = rb_utf8_encoding();
    }
    else {
        encoding = default_encoding;
    }
 
    return rb_enc_str_new((const char *) pm_string_source(string), pm_string_length(string), encoding);
}
 
static inline VALUE
parse_static_literal_string(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, const pm_string_t *string)
{
    rb_encoding *encoding;
 
    if (node->flags & PM_STRING_FLAGS_FORCED_BINARY_ENCODING) {
        encoding = rb_ascii8bit_encoding();
    }
    else if (node->flags & PM_STRING_FLAGS_FORCED_UTF8_ENCODING) {
        encoding = rb_utf8_encoding();
    }
    else {
        encoding = scope_node->encoding;
    }
 
    VALUE value = rb_enc_literal_str((const char *) pm_string_source(string), pm_string_length(string), encoding);
    rb_enc_str_coderange(value);
 
    if (ISEQ_COMPILE_DATA(iseq)->option->debug_frozen_string_literal || RTEST(ruby_debug)) {
        int line_number = pm_node_line_number_cached(node, scope_node);
        value = rb_ractor_make_shareable(rb_str_with_debug_created_info(value, rb_iseq_path(iseq), line_number));
    }
 
    return value;
}
 
static inline ID
parse_string_symbol(const pm_scope_node_t *scope_node, const pm_symbol_node_t *symbol)
{
    rb_encoding *encoding;
    if (symbol->base.flags & PM_SYMBOL_FLAGS_FORCED_UTF8_ENCODING) {
        encoding = rb_utf8_encoding();
    }
    else if (symbol->base.flags & PM_SYMBOL_FLAGS_FORCED_BINARY_ENCODING) {
        encoding = rb_ascii8bit_encoding();
    }
    else if (symbol->base.flags & PM_SYMBOL_FLAGS_FORCED_US_ASCII_ENCODING) {
        encoding = rb_usascii_encoding();
    }
    else {
        encoding = scope_node->encoding;
    }
 
    return rb_intern3((const char *) pm_string_source(&symbol->unescaped), pm_string_length(&symbol->unescaped), encoding);
}
 
static int
pm_optimizable_range_item_p(const pm_node_t *node)
{
    return (!node || PM_NODE_TYPE_P(node, PM_INTEGER_NODE) || PM_NODE_TYPE_P(node, PM_NIL_NODE));
}
 
static VALUE
parse_regexp_error(rb_iseq_t *iseq, int32_t line_number, const char *fmt, ...)
{
    va_list args;
    va_start(args, fmt);
    VALUE error = rb_syntax_error_append(Qnil, rb_iseq_path(iseq), line_number, -1, NULL, "%" PRIsVALUE, args);
    va_end(args);
    rb_exc_raise(error);
}
 
static VALUE
parse_regexp_string_part(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, const pm_string_t *unescaped, rb_encoding *implicit_regexp_encoding, rb_encoding *explicit_regexp_encoding)
{
    // If we were passed an explicit regexp encoding, then we need to double
    // check that it's okay here for this fragment of the string.
    rb_encoding *encoding;
 
    if (explicit_regexp_encoding != NULL) {
        encoding = explicit_regexp_encoding;
    }
    else if (node->flags & PM_STRING_FLAGS_FORCED_BINARY_ENCODING) {
        encoding = rb_ascii8bit_encoding();
    }
    else if (node->flags & PM_STRING_FLAGS_FORCED_UTF8_ENCODING) {
        encoding = rb_utf8_encoding();
    }
    else {
        encoding = implicit_regexp_encoding;
    }
 
    VALUE string = rb_enc_str_new((const char *) pm_string_source(unescaped), pm_string_length(unescaped), encoding);
    VALUE error = rb_reg_check_preprocess(string);
 
    if (error != Qnil) parse_regexp_error(iseq, pm_node_line_number_cached(node, scope_node), "%" PRIsVALUE, rb_obj_as_string(error));
    return string;
}
 
static VALUE
pm_static_literal_concat(rb_iseq_t *iseq, const pm_node_list_t *nodes, pm_scope_node_t *scope_node, rb_encoding *implicit_regexp_encoding, rb_encoding *explicit_regexp_encoding, bool top)
{
    VALUE current = Qnil;
 
    for (size_t index = 0; index < nodes->size; index++) {
        const pm_node_t *part = nodes->nodes[index];
        VALUE string;
 
        switch (PM_NODE_TYPE(part)) {
          case PM_STRING_NODE:
            if (implicit_regexp_encoding != NULL) {
                if (top) {
                    string = parse_regexp_string_part(iseq, scope_node, part, &((const pm_string_node_t *) part)->unescaped, implicit_regexp_encoding, explicit_regexp_encoding);
                }
                else {
                    string = parse_string_encoded(part, &((const pm_string_node_t *) part)->unescaped, scope_node->encoding);
                    VALUE error = rb_reg_check_preprocess(string);
                    if (error != Qnil) parse_regexp_error(iseq, pm_node_line_number_cached(part, scope_node), "%" PRIsVALUE, rb_obj_as_string(error));
                }
            }
            else {
                string = parse_string_encoded(part, &((const pm_string_node_t *) part)->unescaped, scope_node->encoding);
            }
            break;
          case PM_INTERPOLATED_STRING_NODE:
            string = pm_static_literal_concat(iseq, &((const pm_interpolated_string_node_t *) part)->parts, scope_node, implicit_regexp_encoding, explicit_regexp_encoding, false);
            break;
          case PM_EMBEDDED_STATEMENTS_NODE: {
            const pm_embedded_statements_node_t *cast = (const pm_embedded_statements_node_t *) part;
            string = pm_static_literal_concat(iseq, &cast->statements->body, scope_node, implicit_regexp_encoding, explicit_regexp_encoding, false);
            break;
          }
          default:
            RUBY_ASSERT(false && "unexpected node type in pm_static_literal_concat");
            return Qnil;
        }
 
        if (current != Qnil) {
            current = rb_str_concat(current, string);
        }
        else {
            current = string;
        }
    }
 
    return top ? rb_fstring(current) : current;
}
 
#define RE_OPTION_ENCODING_SHIFT 8
#define RE_OPTION_ENCODING(encoding) (((encoding) & 0xFF) << RE_OPTION_ENCODING_SHIFT)
#define ARG_ENCODING_NONE    32
#define ARG_ENCODING_FIXED   16
#define ENC_ASCII8BIT        1
#define ENC_EUC_JP           2
#define ENC_Windows_31J      3
#define ENC_UTF8             4
 
static int
parse_regexp_flags(const pm_node_t *node)
{
    int flags = 0;
 
    // Check "no encoding" first so that flags don't get clobbered
    // We're calling `rb_char_to_option_kcode` in this case so that
    // we don't need to have access to `ARG_ENCODING_NONE`
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_ASCII_8BIT)) {
        flags |= ARG_ENCODING_NONE;
    }
 
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_EUC_JP)) {
        flags |= (ARG_ENCODING_FIXED | RE_OPTION_ENCODING(ENC_EUC_JP));
    }
 
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_WINDOWS_31J)) {
        flags |= (ARG_ENCODING_FIXED | RE_OPTION_ENCODING(ENC_Windows_31J));
    }
 
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_UTF_8)) {
        flags |= (ARG_ENCODING_FIXED | RE_OPTION_ENCODING(ENC_UTF8));
    }
 
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_IGNORE_CASE)) {
        flags |= ONIG_OPTION_IGNORECASE;
    }
 
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_MULTI_LINE)) {
        flags |= ONIG_OPTION_MULTILINE;
    }
 
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_EXTENDED)) {
        flags |= ONIG_OPTION_EXTEND;
    }
 
    return flags;
}
 
#undef RE_OPTION_ENCODING_SHIFT
#undef RE_OPTION_ENCODING
#undef ARG_ENCODING_FIXED
#undef ARG_ENCODING_NONE
#undef ENC_ASCII8BIT
#undef ENC_EUC_JP
#undef ENC_Windows_31J
#undef ENC_UTF8
 
static rb_encoding *
parse_regexp_encoding(const pm_scope_node_t *scope_node, const pm_node_t *node)
{
    if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_FORCED_BINARY_ENCODING) || PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_ASCII_8BIT)) {
        return rb_ascii8bit_encoding();
    }
    else if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_UTF_8)) {
        return rb_utf8_encoding();
    }
    else if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_EUC_JP)) {
        return rb_enc_get_from_index(ENCINDEX_EUC_JP);
    }
    else if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_WINDOWS_31J)) {
        return rb_enc_get_from_index(ENCINDEX_Windows_31J);
    }
    else {
        return NULL;
    }
}
 
static VALUE
parse_regexp(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, VALUE string)
{
    VALUE errinfo = rb_errinfo();
 
    int32_t line_number = pm_node_line_number_cached(node, scope_node);
    VALUE regexp = rb_reg_compile(string, parse_regexp_flags(node), (const char *) pm_string_source(pm_parser_filepath(scope_node->parser)), line_number);
 
    if (NIL_P(regexp)) {
        VALUE message = rb_attr_get(rb_errinfo(), idMesg);
        rb_set_errinfo(errinfo);
 
        parse_regexp_error(iseq, line_number, "%" PRIsVALUE, message);
        return Qnil;
    }
 
    return RB_OBJ_SET_SHAREABLE(rb_obj_freeze(regexp));
}
 
static inline VALUE
parse_regexp_literal(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, const pm_string_t *unescaped)
{
    rb_encoding *regexp_encoding = parse_regexp_encoding(scope_node, node);
    if (regexp_encoding == NULL) regexp_encoding = scope_node->encoding;
 
    VALUE string = rb_enc_str_new((const char *) pm_string_source(unescaped), pm_string_length(unescaped), regexp_encoding);
    RB_OBJ_SET_SHAREABLE(string);
    return parse_regexp(iseq, scope_node, node, string);
}
 
static inline VALUE
parse_regexp_concat(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, const pm_node_list_t *parts)
{
    rb_encoding *explicit_regexp_encoding = parse_regexp_encoding(scope_node, node);
    rb_encoding *implicit_regexp_encoding = explicit_regexp_encoding != NULL ? explicit_regexp_encoding : scope_node->encoding;
 
    VALUE string = pm_static_literal_concat(iseq, parts, scope_node, implicit_regexp_encoding, explicit_regexp_encoding, false);
    return parse_regexp(iseq, scope_node, node, string);
}
 
static void pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node);
 
static int
pm_interpolated_node_compile(rb_iseq_t *iseq, const pm_node_list_t *parts, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node, rb_encoding *implicit_regexp_encoding, rb_encoding *explicit_regexp_encoding, bool mutable_result, bool frozen_result)
{
    int stack_size = 0;
    size_t parts_size = parts->size;
    bool interpolated = false;
 
    if (parts_size > 0) {
        VALUE current_string = Qnil;
        pm_node_location_t current_location = *node_location;
 
        for (size_t index = 0; index < parts_size; index++) {
            const pm_node_t *part = parts->nodes[index];
 
            if (PM_NODE_TYPE_P(part, PM_STRING_NODE)) {
                const pm_string_node_t *string_node = (const pm_string_node_t *) part;
                VALUE string_value;
 
                if (implicit_regexp_encoding == NULL) {
                    string_value = parse_string_encoded(part, &string_node->unescaped, scope_node->encoding);
                }
                else {
                    string_value = parse_regexp_string_part(iseq, scope_node, (const pm_node_t *) string_node, &string_node->unescaped, implicit_regexp_encoding, explicit_regexp_encoding);
                }
 
                if (RTEST(current_string)) {
                    current_string = rb_str_concat(current_string, string_value);
                }
                else {
                    current_string = string_value;
                    if (index != 0) current_location = PM_NODE_END_LOCATION(part);
                }
            }
            else {
                interpolated = true;
 
                if (
                    PM_NODE_TYPE_P(part, PM_EMBEDDED_STATEMENTS_NODE) &&
                    ((const pm_embedded_statements_node_t *) part)->statements != NULL &&
                    ((const pm_embedded_statements_node_t *) part)->statements->body.size == 1 &&
                    PM_NODE_TYPE_P(((const pm_embedded_statements_node_t *) part)->statements->body.nodes[0], PM_STRING_NODE)
                ) {
                    const pm_string_node_t *string_node = (const pm_string_node_t *) ((const pm_embedded_statements_node_t *) part)->statements->body.nodes[0];
                    VALUE string_value;
 
                    if (implicit_regexp_encoding == NULL) {
                        string_value = parse_string_encoded(part, &string_node->unescaped, scope_node->encoding);
                    }
                    else {
                        string_value = parse_regexp_string_part(iseq, scope_node, (const pm_node_t *) string_node, &string_node->unescaped, implicit_regexp_encoding, explicit_regexp_encoding);
                    }
 
                    if (RTEST(current_string)) {
                        current_string = rb_str_concat(current_string, string_value);
                    }
                    else {
                        current_string = string_value;
                        current_location = PM_NODE_START_LOCATION(part);
                    }
                }
                else {
                    if (!RTEST(current_string)) {
                        rb_encoding *encoding;
 
                        if (implicit_regexp_encoding != NULL) {
                            if (explicit_regexp_encoding != NULL) {
                                encoding = explicit_regexp_encoding;
                            }
                            else if (pm_parser_encoding_us_ascii(scope_node->parser)) {
                                encoding = rb_ascii8bit_encoding();
                            }
                            else {
                                encoding = implicit_regexp_encoding;
                            }
                        }
                        else {
                            encoding = scope_node->encoding;
                        }
 
                        if (parts_size == 1) {
                            current_string = rb_enc_str_new(NULL, 0, encoding);
                        }
                    }
 
                    if (RTEST(current_string)) {
                        VALUE operand = rb_fstring(current_string);
                        PUSH_INSN1(ret, current_location, putobject, operand);
                        stack_size++;
                    }
 
                    PM_COMPILE_NOT_POPPED(part);
 
                    const pm_node_location_t current_location = PM_NODE_START_LOCATION(part);
                    PUSH_INSN(ret, current_location, dup);
 
                    {
                        const struct rb_callinfo *callinfo = new_callinfo(iseq, idTo_s, 0, VM_CALL_FCALL | VM_CALL_ARGS_SIMPLE, NULL, FALSE);
                        PUSH_INSN1(ret, current_location, objtostring, callinfo);
                    }
 
                    PUSH_INSN(ret, current_location, anytostring);
 
                    current_string = Qnil;
                    stack_size++;
                }
            }
        }
 
        if (RTEST(current_string)) {
            current_string = rb_fstring(current_string);
 
            if (stack_size == 0) {
                if (frozen_result) {
                    PUSH_INSN1(ret, current_location, putobject, current_string);
                } else if (mutable_result || interpolated) {
                    PUSH_INSN1(ret, current_location, dupstring, current_string);
                } else {
                    PUSH_INSN1(ret, current_location, dupchilledstring, current_string);
                }
            } else {
                PUSH_INSN1(ret, current_location, putobject, current_string);
            }
 
            current_string = Qnil;
            stack_size++;
        }
    }
    else {
        PUSH_INSN(ret, *node_location, putnil);
    }
 
    return stack_size;
}
 
static void
pm_compile_regexp_dynamic(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_list_t *parts, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    rb_encoding *explicit_regexp_encoding = parse_regexp_encoding(scope_node, node);
    rb_encoding *implicit_regexp_encoding = explicit_regexp_encoding != NULL ? explicit_regexp_encoding : scope_node->encoding;
 
    int length = pm_interpolated_node_compile(iseq, parts, node_location, ret, popped, scope_node, implicit_regexp_encoding, explicit_regexp_encoding, false, false);
    PUSH_INSN2(ret, *node_location, toregexp, INT2FIX(parse_regexp_flags(node) & 0xFF), INT2FIX(length));
}
 
static VALUE
pm_source_file_value(const pm_source_file_node_t *node, const pm_scope_node_t *scope_node)
{
    const pm_string_t *filepath = &node->filepath;
    size_t length = pm_string_length(filepath);
 
    if (length > 0) {
        rb_encoding *filepath_encoding = scope_node->filepath_encoding != NULL ? scope_node->filepath_encoding : rb_utf8_encoding();
        return rb_enc_interned_str((const char *) pm_string_source(filepath), length, filepath_encoding);
    }
    else {
        return rb_fstring_lit("<compiled>");
    }
}
 
static VALUE
pm_static_literal_string(rb_iseq_t *iseq, VALUE string, int line_number)
{
    if (ISEQ_COMPILE_DATA(iseq)->option->debug_frozen_string_literal || RTEST(ruby_debug)) {
        VALUE str = rb_str_with_debug_created_info(string, rb_iseq_path(iseq), line_number);
        RB_OBJ_SET_SHAREABLE(str);
        return str;
    }
    else {
        return rb_fstring(string);
    }
}
 
static VALUE
pm_static_literal_value(rb_iseq_t *iseq, const pm_node_t *node, pm_scope_node_t *scope_node)
{
    // Every node that comes into this function should already be marked as
    // static literal. If it's not, then we have a bug somewhere.
    RUBY_ASSERT(PM_NODE_FLAG_P(node, PM_NODE_FLAG_STATIC_LITERAL));
 
    switch (PM_NODE_TYPE(node)) {
      case PM_ARRAY_NODE: {
        const pm_array_node_t *cast = (const pm_array_node_t *) node;
        const pm_node_list_t *elements = &cast->elements;
 
        VALUE value = rb_ary_hidden_new(elements->size);
        for (size_t index = 0; index < elements->size; index++) {
            rb_ary_push(value, pm_static_literal_value(iseq, elements->nodes[index], scope_node));
        }
 
        RB_OBJ_SET_FROZEN_SHAREABLE(value);
        return value;
      }
      case PM_FALSE_NODE:
        return Qfalse;
      case PM_FLOAT_NODE:
        return parse_float((const pm_float_node_t *) node);
      case PM_HASH_NODE: {
        const pm_hash_node_t *cast = (const pm_hash_node_t *) node;
        const pm_node_list_t *elements = &cast->elements;
 
        VALUE array = rb_ary_hidden_new(elements->size * 2);
        for (size_t index = 0; index < elements->size; index++) {
            RUBY_ASSERT(PM_NODE_TYPE_P(elements->nodes[index], PM_ASSOC_NODE));
            const pm_assoc_node_t *cast = (const pm_assoc_node_t *) elements->nodes[index];
            VALUE pair[2] = { pm_static_literal_value(iseq, cast->key, scope_node), pm_static_literal_value(iseq, cast->value, scope_node) };
            rb_ary_cat(array, pair, 2);
        }
 
        VALUE value = rb_hash_alloc_fixed_size(Qfalse, elements->size);
        rb_hash_bulk_insert(RARRAY_LEN(array), RARRAY_CONST_PTR(array), value);
        RB_GC_GUARD(array);
 
        RB_OBJ_SET_FROZEN_SHAREABLE(value);
        return value;
      }
      case PM_IMAGINARY_NODE:
        return parse_imaginary((const pm_imaginary_node_t *) node);
      case PM_INTEGER_NODE:
        return parse_integer((const pm_integer_node_t *) node);
      case PM_INTERPOLATED_MATCH_LAST_LINE_NODE: {
        const pm_interpolated_match_last_line_node_t *cast = (const pm_interpolated_match_last_line_node_t *) node;
        return parse_regexp_concat(iseq, scope_node, (const pm_node_t *) cast, &cast->parts);
      }
      case PM_INTERPOLATED_REGULAR_EXPRESSION_NODE: {
        const pm_interpolated_regular_expression_node_t *cast = (const pm_interpolated_regular_expression_node_t *) node;
        return parse_regexp_concat(iseq, scope_node, (const pm_node_t *) cast, &cast->parts);
      }
      case PM_INTERPOLATED_STRING_NODE: {
        VALUE string = pm_static_literal_concat(iseq, &((const pm_interpolated_string_node_t *) node)->parts, scope_node, NULL, NULL, false);
        int line_number = pm_node_line_number_cached(node, scope_node);
        return pm_static_literal_string(iseq, string, line_number);
      }
      case PM_INTERPOLATED_SYMBOL_NODE: {
        const pm_interpolated_symbol_node_t *cast = (const pm_interpolated_symbol_node_t *) node;
        VALUE string = pm_static_literal_concat(iseq, &cast->parts, scope_node, NULL, NULL, true);
 
        return ID2SYM(rb_intern_str(string));
      }
      case PM_MATCH_LAST_LINE_NODE: {
        const pm_match_last_line_node_t *cast = (const pm_match_last_line_node_t *) node;
        return parse_regexp_literal(iseq, scope_node, (const pm_node_t *) cast, &cast->unescaped);
      }
      case PM_NIL_NODE:
        return Qnil;
      case PM_RATIONAL_NODE:
        return parse_rational((const pm_rational_node_t *) node);
      case PM_REGULAR_EXPRESSION_NODE: {
        const pm_regular_expression_node_t *cast = (const pm_regular_expression_node_t *) node;
        return parse_regexp_literal(iseq, scope_node, (const pm_node_t *) cast, &cast->unescaped);
      }
      case PM_SOURCE_ENCODING_NODE:
        return rb_enc_from_encoding(scope_node->encoding);
      case PM_SOURCE_LINE_NODE:
        return INT2FIX(pm_node_line_number_cached(node, scope_node));
      case PM_STRING_NODE: {
        const pm_string_node_t *cast = (const pm_string_node_t *) node;
        return parse_static_literal_string(iseq, scope_node, node, &cast->unescaped);
      }
      case PM_SYMBOL_NODE:
        return ID2SYM(parse_string_symbol(scope_node, (const pm_symbol_node_t *) node));
      case PM_TRUE_NODE:
        return Qtrue;
      default:
        rb_bug("Don't have a literal value for node type %s", pm_node_type(PM_NODE_TYPE(node)));
        return Qfalse;
    }
}
 
static rb_code_location_t
pm_code_location(pm_scope_node_t *scope_node, const pm_node_t *node)
{
    const pm_line_column_t start_location = PM_NODE_START_LINE_COLUMN(node);
    const pm_line_column_t end_location = PM_NODE_END_LINE_COLUMN(node);
 
    return (rb_code_location_t) {
        .beg_pos = { .lineno = start_location.line, .column = start_location.column },
        .end_pos = { .lineno = end_location.line, .column = end_location.column }
    };
}
 
#define PM_BRANCH_COVERAGE_P(iseq) (ISEQ_COVERAGE(iseq) && ISEQ_BRANCH_COVERAGE(iseq))
 
static void
pm_compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const pm_node_t *cond,
                         LABEL *then_label, LABEL *else_label, pm_scope_node_t *scope_node);
 
static void
pm_compile_logical(rb_iseq_t *iseq, LINK_ANCHOR *const ret, pm_node_t *cond, LABEL *then_label, LABEL *else_label, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(cond);
 
    DECL_ANCHOR(seq);
 
    LABEL *label = NEW_LABEL(location.line);
    if (!then_label) then_label = label;
    else if (!else_label) else_label = label;
 
    pm_compile_branch_condition(iseq, seq, cond, then_label, else_label, scope_node);
 
    if (LIST_INSN_SIZE_ONE(seq)) {
        INSN *insn = (INSN *) ELEM_FIRST_INSN(FIRST_ELEMENT(seq));
        if (insn->insn_id == BIN(jump) && (LABEL *)(insn->operands[0]) == label) return;
    }
 
    if (label->refcnt) {
        PUSH_LABEL(seq, label);
    }
 
    PUSH_SEQ(ret, seq);
    return;
}
 
static void
pm_compile_flip_flop_bound(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    if (PM_NODE_TYPE_P(node, PM_INTEGER_NODE)) {
        PM_COMPILE_NOT_POPPED(node);
 
        VALUE operand = ID2SYM(rb_intern("$."));
        PUSH_INSN1(ret, location, getglobal, operand);
 
        PUSH_SEND(ret, location, idEq, INT2FIX(1));
        if (popped) PUSH_INSN(ret, location, pop);
    }
    else {
        PM_COMPILE(node);
    }
}
 
static void
pm_compile_flip_flop(const pm_flip_flop_node_t *flip_flop_node, LABEL *else_label, LABEL *then_label, rb_iseq_t *iseq, const int lineno, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = { .line = lineno, .node_id = -1 };
    LABEL *lend = NEW_LABEL(location.line);
 
    int again = !(flip_flop_node->base.flags & PM_RANGE_FLAGS_EXCLUDE_END);
 
    rb_num_t count = ISEQ_FLIP_CNT_INCREMENT(ISEQ_BODY(iseq)->local_iseq) + VM_SVAR_FLIPFLOP_START;
    VALUE key = INT2FIX(count);
 
    PUSH_INSN2(ret, location, getspecial, key, INT2FIX(0));
    PUSH_INSNL(ret, location, branchif, lend);
 
    if (flip_flop_node->left) {
        pm_compile_flip_flop_bound(iseq, flip_flop_node->left, ret, popped, scope_node);
    }
    else {
        PUSH_INSN(ret, location, putnil);
    }
 
    PUSH_INSNL(ret, location, branchunless, else_label);
    PUSH_INSN1(ret, location, putobject, Qtrue);
    PUSH_INSN1(ret, location, setspecial, key);
    if (!again) {
        PUSH_INSNL(ret, location, jump, then_label);
    }
 
    PUSH_LABEL(ret, lend);
    if (flip_flop_node->right) {
        pm_compile_flip_flop_bound(iseq, flip_flop_node->right, ret, popped, scope_node);
    }
    else {
        PUSH_INSN(ret, location, putnil);
    }
 
    PUSH_INSNL(ret, location, branchunless, then_label);
    PUSH_INSN1(ret, location, putobject, Qfalse);
    PUSH_INSN1(ret, location, setspecial, key);
    PUSH_INSNL(ret, location, jump, then_label);
}
 
static void pm_compile_defined_expr(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node, bool in_condition);
 
static void
pm_compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const pm_node_t *cond, LABEL *then_label, LABEL *else_label, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(cond);
 
again:
    switch (PM_NODE_TYPE(cond)) {
      case PM_AND_NODE: {
        const pm_and_node_t *cast = (const pm_and_node_t *) cond;
        pm_compile_logical(iseq, ret, cast->left, NULL, else_label, scope_node);
 
        cond = cast->right;
        goto again;
      }
      case PM_OR_NODE: {
        const pm_or_node_t *cast = (const pm_or_node_t *) cond;
        pm_compile_logical(iseq, ret, cast->left, then_label, NULL, scope_node);
 
        cond = cast->right;
        goto again;
      }
      case PM_FALSE_NODE:
      case PM_NIL_NODE:
        PUSH_INSNL(ret, location, jump, else_label);
        return;
      case PM_FLOAT_NODE:
      case PM_IMAGINARY_NODE:
      case PM_INTEGER_NODE:
      case PM_LAMBDA_NODE:
      case PM_RATIONAL_NODE:
      case PM_REGULAR_EXPRESSION_NODE:
      case PM_STRING_NODE:
      case PM_SYMBOL_NODE:
      case PM_TRUE_NODE:
        PUSH_INSNL(ret, location, jump, then_label);
        return;
      case PM_FLIP_FLOP_NODE:
        pm_compile_flip_flop((const pm_flip_flop_node_t *) cond, else_label, then_label, iseq, location.line, ret, false, scope_node);
        return;
      case PM_DEFINED_NODE: {
        const pm_defined_node_t *cast = (const pm_defined_node_t *) cond;
        pm_compile_defined_expr(iseq, cast->value, &location, ret, false, scope_node, true);
        break;
      }
      default: {
        DECL_ANCHOR(cond_seq);
        pm_compile_node(iseq, cond, cond_seq, false, scope_node);
 
        if (LIST_INSN_SIZE_ONE(cond_seq)) {
            INSN *insn = (INSN *) ELEM_FIRST_INSN(FIRST_ELEMENT(cond_seq));
 
            if (insn->insn_id == BIN(putobject)) {
                if (RTEST(insn->operands[0])) {
                    PUSH_INSNL(ret, location, jump, then_label);
                    // maybe unreachable
                    return;
                }
                else {
                    PUSH_INSNL(ret, location, jump, else_label);
                    return;
                }
            }
        }
 
        PUSH_SEQ(ret, cond_seq);
        break;
      }
    }
 
    PUSH_INSNL(ret, location, branchunless, else_label);
    PUSH_INSNL(ret, location, jump, then_label);
}
 
static void
pm_compile_conditional(rb_iseq_t *iseq, const pm_node_location_t *node_location, pm_node_type_t type, const pm_node_t *node, const pm_statements_node_t *statements, const pm_node_t *subsequent, const pm_node_t *predicate, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    LABEL *then_label = NEW_LABEL(location.line);
    LABEL *else_label = NEW_LABEL(location.line);
    LABEL *end_label = NULL;
 
    DECL_ANCHOR(cond_seq);
    pm_compile_branch_condition(iseq, cond_seq, predicate, then_label, else_label, scope_node);
    PUSH_SEQ(ret, cond_seq);
 
    rb_code_location_t conditional_location = { 0 };
    VALUE branches = Qfalse;
 
    if (then_label->refcnt && else_label->refcnt && PM_BRANCH_COVERAGE_P(iseq)) {
        conditional_location = pm_code_location(scope_node, node);
        branches = decl_branch_base(iseq, (int) node->node_id, &conditional_location, type == PM_IF_NODE ? "if" : "unless");
    }
 
    if (then_label->refcnt) {
        PUSH_LABEL(ret, then_label);
 
        DECL_ANCHOR(then_seq);
 
        if (statements != NULL) {
            pm_compile_node(iseq, (const pm_node_t *) statements, then_seq, popped, scope_node);
        }
        else if (!popped) {
            PUSH_SYNTHETIC_PUTNIL(then_seq, iseq);
        }
 
        if (else_label->refcnt) {
            // Establish branch coverage for the then block.
            if (PM_BRANCH_COVERAGE_P(iseq)) {
                rb_code_location_t branch_location;
 
                if (statements != NULL) {
                    branch_location = pm_code_location(scope_node, (const pm_node_t *) statements);
                } else if (type == PM_IF_NODE) {
                    pm_line_column_t predicate_end = PM_NODE_END_LINE_COLUMN(predicate);
                    branch_location = (rb_code_location_t) {
                        .beg_pos = { .lineno = predicate_end.line, .column = predicate_end.column },
                        .end_pos = { .lineno = predicate_end.line, .column = predicate_end.column }
                    };
                } else {
                    branch_location = conditional_location;
                }
 
                add_trace_branch_coverage(iseq, ret, &branch_location, branch_location.beg_pos.column, 0, type == PM_IF_NODE ? "then" : "else", branches);
            }
 
            end_label = NEW_LABEL(location.line);
            PUSH_INSNL(then_seq, location, jump, end_label);
            if (!popped) PUSH_INSN(then_seq, location, pop);
        }
 
        PUSH_SEQ(ret, then_seq);
    }
 
    if (else_label->refcnt) {
        PUSH_LABEL(ret, else_label);
 
        DECL_ANCHOR(else_seq);
 
        if (subsequent != NULL) {
            pm_compile_node(iseq, subsequent, else_seq, popped, scope_node);
        }
        else if (!popped) {
            PUSH_SYNTHETIC_PUTNIL(else_seq, iseq);
        }
 
        // Establish branch coverage for the else block.
        if (then_label->refcnt && PM_BRANCH_COVERAGE_P(iseq)) {
            rb_code_location_t branch_location;
 
            if (subsequent == NULL) {
                branch_location = conditional_location;
            } else if (PM_NODE_TYPE_P(subsequent, PM_ELSE_NODE)) {
                const pm_else_node_t *else_node = (const pm_else_node_t *) subsequent;
                branch_location = pm_code_location(scope_node, else_node->statements != NULL ? ((const pm_node_t *) else_node->statements) : (const pm_node_t *) else_node);
            } else {
                branch_location = pm_code_location(scope_node, (const pm_node_t *) subsequent);
            }
 
            add_trace_branch_coverage(iseq, ret, &branch_location, branch_location.beg_pos.column, 1, type == PM_IF_NODE ? "else" : "then", branches);
        }
 
        PUSH_SEQ(ret, else_seq);
    }
 
    if (end_label) {
        PUSH_LABEL(ret, end_label);
    }
 
    return;
}
 
static void
pm_compile_loop(rb_iseq_t *iseq, const pm_node_location_t *node_location, pm_node_flags_t flags, enum pm_node_type type, const pm_node_t *node, const pm_statements_node_t *statements, const pm_node_t *predicate, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
 
    LABEL *prev_start_label = ISEQ_COMPILE_DATA(iseq)->start_label;
    LABEL *prev_end_label = ISEQ_COMPILE_DATA(iseq)->end_label;
    LABEL *prev_redo_label = ISEQ_COMPILE_DATA(iseq)->redo_label;
 
    LABEL *next_label = ISEQ_COMPILE_DATA(iseq)->start_label = NEW_LABEL(location.line); /* next  */
    LABEL *redo_label = ISEQ_COMPILE_DATA(iseq)->redo_label = NEW_LABEL(location.line);  /* redo  */
    LABEL *break_label = ISEQ_COMPILE_DATA(iseq)->end_label = NEW_LABEL(location.line);  /* break */
    LABEL *end_label = NEW_LABEL(location.line);
    LABEL *adjust_label = NEW_LABEL(location.line);
 
    LABEL *next_catch_label = NEW_LABEL(location.line);
    LABEL *tmp_label = NULL;
 
    // We're pushing onto the ensure stack because breaks need to break out of
    // this loop and not break into the ensure statements within the same
    // lexical scope.
    struct iseq_compile_data_ensure_node_stack enl;
    push_ensure_entry(iseq, &enl, NULL, NULL);
 
    // begin; end while true
    if (flags & PM_LOOP_FLAGS_BEGIN_MODIFIER) {
        tmp_label = NEW_LABEL(location.line);
        PUSH_INSNL(ret, location, jump, tmp_label);
    }
    else {
        // while true; end
        PUSH_INSNL(ret, location, jump, next_label);
    }
 
    PUSH_LABEL(ret, adjust_label);
    PUSH_INSN(ret, location, putnil);
    PUSH_LABEL(ret, next_catch_label);
    PUSH_INSN(ret, location, pop);
    PUSH_INSNL(ret, location, jump, next_label);
    if (tmp_label) PUSH_LABEL(ret, tmp_label);
 
    PUSH_LABEL(ret, redo_label);
 
    // Establish branch coverage for the loop.
    if (PM_BRANCH_COVERAGE_P(iseq)) {
        rb_code_location_t loop_location = pm_code_location(scope_node, node);
        VALUE branches = decl_branch_base(iseq, (int) node->node_id, &loop_location, type == PM_WHILE_NODE ? "while" : "until");
 
        rb_code_location_t branch_location = statements != NULL ? pm_code_location(scope_node, (const pm_node_t *) statements) : loop_location;
        add_trace_branch_coverage(iseq, ret, &branch_location, branch_location.beg_pos.column, 0, "body", branches);
    }
 
    if (statements != NULL) PM_COMPILE_POPPED((const pm_node_t *) statements);
    PUSH_LABEL(ret, next_label);
 
    if (type == PM_WHILE_NODE) {
        pm_compile_branch_condition(iseq, ret, predicate, redo_label, end_label, scope_node);
    }
    else if (type == PM_UNTIL_NODE) {
        pm_compile_branch_condition(iseq, ret, predicate, end_label, redo_label, scope_node);
    }
 
    PUSH_LABEL(ret, end_label);
    PUSH_ADJUST_RESTORE(ret, adjust_label);
    PUSH_INSN(ret, location, putnil);
 
    PUSH_LABEL(ret, break_label);
    if (popped) PUSH_INSN(ret, location, pop);
 
    PUSH_CATCH_ENTRY(CATCH_TYPE_BREAK, redo_label, break_label, NULL, break_label);
    PUSH_CATCH_ENTRY(CATCH_TYPE_NEXT, redo_label, break_label, NULL, next_catch_label);
    PUSH_CATCH_ENTRY(CATCH_TYPE_REDO, redo_label, break_label, NULL, ISEQ_COMPILE_DATA(iseq)->redo_label);
 
    ISEQ_COMPILE_DATA(iseq)->start_label = prev_start_label;
    ISEQ_COMPILE_DATA(iseq)->end_label = prev_end_label;
    ISEQ_COMPILE_DATA(iseq)->redo_label = prev_redo_label;
    ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = ISEQ_COMPILE_DATA(iseq)->ensure_node_stack->prev;
 
    return;
}
 
// This recurses through scopes and finds the local index at any scope level
// It also takes a pointer to depth, and increments depth appropriately
// according to the depth of the local.
static pm_local_index_t
pm_lookup_local_index(rb_iseq_t *iseq, const pm_scope_node_t *scope_node, pm_constant_id_t constant_id, int start_depth)
{
    pm_local_index_t lindex = { 0 };
    int local_index;
 
    int level;
    for (level = 0; level < start_depth; level++) {
        scope_node = scope_node->previous;
    }
 
    while (!pm_index_lookup_table_lookup(&scope_node->index_lookup_table, constant_id, &local_index))
    {
        level++;
 
        if (scope_node->previous) {
            scope_node = scope_node->previous;
        }
        else {
            // We have recursed up all scope nodes
            // and have not found the local yet
            rb_bug("Local with constant_id %u does not exist", (unsigned int) constant_id);
        }
    }
 
    lindex.level = level;
    lindex.index = scope_node->local_table_for_iseq_size - (int) local_index;
    return lindex;
}
 
// This returns the CRuby ID which maps to the pm_constant_id_t
//
// Constant_ids in prism are indexes of the constants in prism's constant pool.
// We add a constants mapping on the scope_node which is a mapping from
// these constant_id indexes to the CRuby IDs that they represent.
// This helper method allows easy access to those IDs
static inline ID
pm_constant_id_lookup(const pm_scope_node_t *scope_node, pm_constant_id_t constant_id)
{
    RUBY_ASSERT(constant_id >= 1 && constant_id <= pm_parser_constants_size(scope_node->parser));
    return scope_node->constants[constant_id - 1];
}
 
static rb_iseq_t *
pm_new_child_iseq(rb_iseq_t *iseq, pm_scope_node_t *node, VALUE name, const rb_iseq_t *parent, enum rb_iseq_type type, int line_no)
{
    debugs("[new_child_iseq]> ---------------------------------------\n");
    int isolated_depth = ISEQ_COMPILE_DATA(iseq)->isolated_depth;
    rb_iseq_t *ret_iseq = pm_iseq_build(node, name,
            rb_iseq_path(iseq), rb_iseq_realpath(iseq),
            line_no, parent,
            isolated_depth ? isolated_depth + 1 : 0,
            type, ISEQ_COMPILE_DATA(iseq)->option);
    debugs("[new_child_iseq]< ---------------------------------------\n");
    return ret_iseq;
}
 
static int
pm_cpath_const_p(const pm_node_t *node)
{
    switch (PM_NODE_TYPE(node)) {
      case PM_CONSTANT_READ_NODE:
        return TRUE;
      case PM_CONSTANT_PATH_NODE:
        {
            const pm_node_t *parent = ((const pm_constant_path_node_t *) node)->parent;
            if (!parent) return TRUE; /* ::Foo */
            return pm_cpath_const_p(parent);
        }
      default:
        return FALSE;
    }
}
 
static int
pm_compile_class_path(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    if (PM_NODE_TYPE_P(node, PM_CONSTANT_PATH_NODE)) {
        const pm_node_t *parent = ((const pm_constant_path_node_t *) node)->parent;
 
        if (parent) {
            /* Bar::Foo or expr::Foo */
            PM_COMPILE(parent);
            int flags = VM_DEFINECLASS_FLAG_SCOPED;
            if (!pm_cpath_const_p(parent)) {
                flags |= VM_DEFINECLASS_FLAG_DYNAMIC_CREF;
            }
            return flags;
        }
        else {
            /* toplevel class ::Foo */
            PUSH_INSN1(ret, *node_location, putobject, rb_cObject);
            return VM_DEFINECLASS_FLAG_SCOPED;
        }
    }
    else {
        /* class at cbase Foo */
        PUSH_INSN1(ret, *node_location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
        return 0;
    }
}
 
static void
pm_compile_call_and_or_write_node(rb_iseq_t *iseq, bool and_node, const pm_node_t *receiver, const pm_node_t *value, pm_constant_id_t write_name, pm_constant_id_t read_name, bool safe_nav, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    LABEL *lfin = NEW_LABEL(location.line);
    LABEL *lcfin = NEW_LABEL(location.line);
    LABEL *lskip = NULL;
 
    int flag = PM_NODE_TYPE_P(receiver, PM_SELF_NODE) ? VM_CALL_FCALL : 0;
    ID id_read_name = pm_constant_id_lookup(scope_node, read_name);
 
    PM_COMPILE_NOT_POPPED(receiver);
    if (safe_nav) {
        lskip = NEW_LABEL(location.line);
        PUSH_INSN(ret, location, dup);
        PUSH_INSNL(ret, location, branchnil, lskip);
    }
 
    PUSH_INSN(ret, location, dup);
    PUSH_SEND_WITH_FLAG(ret, location, id_read_name, INT2FIX(0), INT2FIX(flag));
    if (!popped) PUSH_INSN(ret, location, dup);
 
    if (and_node) {
        PUSH_INSNL(ret, location, branchunless, lcfin);
    }
    else {
        PUSH_INSNL(ret, location, branchif, lcfin);
    }
 
    if (!popped) PUSH_INSN(ret, location, pop);
    PM_COMPILE_NOT_POPPED(value);
 
    if (!popped) {
        PUSH_INSN(ret, location, swap);
        PUSH_INSN1(ret, location, topn, INT2FIX(1));
    }
 
    ID id_write_name = pm_constant_id_lookup(scope_node, write_name);
    PUSH_SEND_WITH_FLAG(ret, location, id_write_name, INT2FIX(1), INT2FIX(flag));
    PUSH_INSNL(ret, location, jump, lfin);
 
    PUSH_LABEL(ret, lcfin);
    if (!popped) PUSH_INSN(ret, location, swap);
 
    PUSH_LABEL(ret, lfin);
 
    if (lskip && popped) PUSH_LABEL(ret, lskip);
    PUSH_INSN(ret, location, pop);
    if (lskip && !popped) PUSH_LABEL(ret, lskip);
}
 
static void pm_compile_shareable_constant_value(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_flags_t shareability, VALUE path, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node, bool top);
 
static void
pm_compile_hash_elements(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_list_t *elements, const pm_node_flags_t shareability, VALUE path, bool argument, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    // If this element is not popped, then we need to create the hash on the
    // stack. Neighboring plain assoc nodes should be grouped together (either
    // by newhash or hash merge). Double splat nodes should be merged using the
    // merge_kwd method call.
    const int max_stack_length = 0x100;
    const unsigned int min_tmp_hash_length = 0x800;
 
    int stack_length = 0;
    bool first_chunk = true;
    bool owned_hash = false;
 
    // This is an optimization wherein we keep track of whether or not the
    // previous element was a static literal. If it was, then we do not attempt
    // to check if we have a subhash that can be optimized. If it was not, then
    // we do check.
    bool static_literal = false;
 
    DECL_ANCHOR(anchor);
 
    // Convert pushed elements to a hash, and merge if needed.
#define FLUSH_CHUNK                                                                               \
    if (stack_length) {                                                                           \
        if (first_chunk) {                                                                        \
            PUSH_SEQ(ret, anchor);                                                                \
            PUSH_INSN1(ret, location, newhash, INT2FIX(stack_length));                            \
            first_chunk = false;                                                                  \
        }                                                                                         \
        else {                                                                                    \
            PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));       \
            PUSH_INSN(ret, location, swap);                                                       \
            PUSH_SEQ(ret, anchor);                                                                \
            if (owned_hash) {                                                                     \
                PUSH_SEND(ret, location, id_core_hash_merge_bang_ptr, INT2FIX(stack_length + 1)); \
            }                                                                                     \
            else {                                                                                \
                PUSH_SEND(ret, location, id_core_hash_merge_ptr, INT2FIX(stack_length + 1));      \
                owned_hash = true;                                                                \
            }                                                                                     \
        }                                                                                         \
        INIT_ANCHOR(anchor);                                                                      \
        stack_length = 0;                                                                         \
    }
 
    for (size_t index = 0; index < elements->size; index++) {
        const pm_node_t *element = elements->nodes[index];
 
        switch (PM_NODE_TYPE(element)) {
          case PM_ASSOC_NODE: {
            // Pre-allocation check (this branch can be omitted).
            if (
                (shareability == 0) &&
                PM_NODE_FLAG_P(element, PM_NODE_FLAG_STATIC_LITERAL) && (
                    (!static_literal && ((index + min_tmp_hash_length) < elements->size)) ||
                    (first_chunk && stack_length == 0)
                )
            ) {
                // Count the elements that are statically-known.
                size_t count = 1;
                while (index + count < elements->size && PM_NODE_FLAG_P(elements->nodes[index + count], PM_NODE_FLAG_STATIC_LITERAL)) count++;
 
                bool first_element = first_chunk && stack_length == 0;
 
                if (first_element || count >= min_tmp_hash_length) {
                    // The subsequence of elements in this hash is long enough
                    // to merit its own hash.
                    VALUE ary = rb_ary_hidden_new(count);
 
                    // Create a hidden hash.
                    for (size_t tmp_end = index + count; index < tmp_end; index++) {
                        const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) elements->nodes[index];
 
                        VALUE elem[2] = {
                            pm_static_literal_value(iseq, assoc->key, scope_node),
                            pm_static_literal_value(iseq, assoc->value, scope_node)
                        };
 
                        rb_ary_cat(ary, elem, 2);
                    }
                    index --;
 
                    VALUE hash = rb_hash_alloc_fixed_size(Qfalse, RARRAY_LEN(ary) / 2);
                    rb_hash_bulk_insert(RARRAY_LEN(ary), RARRAY_CONST_PTR(ary), hash);
                    RB_GC_GUARD(ary);
                    RB_OBJ_SET_FROZEN_SHAREABLE(hash);
 
                    // Emit optimized code.
                    FLUSH_CHUNK;
                    if (first_chunk) {
                        if (count == elements->size) {
                            // A fully literal hash.
                            PUSH_INSN1(ret, location, duphash, hash);
                        }
                        else {
                            // Partial hash that will be merged with a newly built one, no need to dup
                            PUSH_INSN1(ret, location, putobject, rb_obj_reveal(hash, rb_cHash));
                        }
                        first_chunk = false;
                    }
                    else {
                        PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
                        PUSH_INSN(ret, location, swap);
                        PUSH_INSN1(ret, location, putobject, hash);
                        PUSH_SEND(ret, location, id_core_hash_merge_kwd, INT2FIX(2));
                    }
 
                    break;
                }
                else {
                    static_literal = true;
                }
            }
            else {
                static_literal = false;
            }
 
            // If this is a plain assoc node, then we can compile it directly
            // and then add the total number of values on the stack.
            if (shareability == 0) {
                pm_compile_node(iseq, element, anchor, false, scope_node);
            }
            else {
                const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) element;
                pm_compile_shareable_constant_value(iseq, assoc->key, shareability, path, ret, scope_node, false);
                pm_compile_shareable_constant_value(iseq, assoc->value, shareability, path, ret, scope_node, false);
            }
 
            if ((stack_length += 2) >= max_stack_length) FLUSH_CHUNK;
            break;
          }
          case PM_ASSOC_SPLAT_NODE: {
            FLUSH_CHUNK;
 
            const pm_assoc_splat_node_t *assoc_splat = (const pm_assoc_splat_node_t *) element;
            bool empty_hash = assoc_splat->value != NULL && (
                (PM_NODE_TYPE_P(assoc_splat->value, PM_HASH_NODE) && ((const pm_hash_node_t *) assoc_splat->value)->elements.size == 0) ||
                PM_NODE_TYPE_P(assoc_splat->value, PM_NIL_NODE)
            );
 
            bool first_element = first_chunk && stack_length == 0;
            bool last_element = index == elements->size - 1;
            bool only_element = first_element && last_element;
 
            if (only_element) {
                if (argument) {
                    if (empty_hash) {
                        // **{} appears at the only keyword argument in method call
                        // We can substitute it for `**nil`.
                        PUSH_INSN(ret, location, putnil);
                    }
                    else {
                        // ** is the only element.
                        // Since we're in a method call, we can use it directly.
                        // This will be not be flagged as mutable.
                        if (shareability == 0) {
                            PM_COMPILE_NOT_POPPED(element);
                        }
                        else {
                            pm_compile_shareable_constant_value(iseq, element, shareability, path, ret, scope_node, false);
                        }
                    }
                }
                else {
                    // {**something}
                    // We can simply call `core_hash_coerce(something)` to ensure it is coerced
                    // into a mutable Hash.
                    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
                    if (shareability == 0) {
                        PM_COMPILE_NOT_POPPED(element);
                    }
                    else {
                        pm_compile_shareable_constant_value(iseq, element, shareability, path, ret, scope_node, false);
                    }
                    PUSH_SEND(ret, location, id_core_hash_coerce, INT2FIX(1));
                }
            }
            else {
                if (!first_element) {
                    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
                    PUSH_INSN(ret, location, swap);
                }
 
                if (shareability == 0) {
                    PM_COMPILE_NOT_POPPED(element);
                }
                else {
                    pm_compile_shareable_constant_value(iseq, element, shareability, path, ret, scope_node, false);
                }
 
                if (!first_element) {
                    if (owned_hash) {
                        PUSH_SEND(ret, location, id_core_hash_merge_bang_kwd, INT2FIX(2));
                    }
                    else {
                        PUSH_SEND(ret, location, id_core_hash_merge_kwd, INT2FIX(2));
                        owned_hash = true;
                    }
                }
            }
 
            first_chunk = false;
            static_literal = false;
            break;
          }
          default:
            RUBY_ASSERT("Invalid node type for hash" && false);
            break;
        }
    }
 
    FLUSH_CHUNK;
#undef FLUSH_CHUNK
}
 
#define SPLATARRAY_FALSE 0
#define SPLATARRAY_TRUE 1
#define DUP_SINGLE_KW_SPLAT 2
 
// This is details. Users should call pm_setup_args() instead.
static int
pm_setup_args_core(const pm_arguments_node_t *arguments_node, const pm_node_t *block, int *flags, const bool has_regular_blockarg, struct rb_callinfo_kwarg **kw_arg, int *dup_rest, rb_iseq_t *iseq, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node, const pm_node_location_t *node_location)
{
    const pm_node_location_t location = *node_location;
 
    int orig_argc = 0;
    bool has_splat = false;
    bool has_keyword_splat = false;
 
    if (arguments_node == NULL) {
        if (*flags & VM_CALL_FCALL) {
            *flags |= VM_CALL_VCALL;
        }
    }
    else {
        const pm_node_list_t *arguments = &arguments_node->arguments;
        has_keyword_splat = PM_NODE_FLAG_P(arguments_node, PM_ARGUMENTS_NODE_FLAGS_CONTAINS_KEYWORD_SPLAT);
 
        // We count the number of elements post the splat node that are not keyword elements to
        // eventually pass as an argument to newarray
        int post_splat_counter = 0;
        const pm_node_t *argument;
 
        PM_NODE_LIST_FOREACH(arguments, index, argument) {
            switch (PM_NODE_TYPE(argument)) {
              // A keyword hash node contains all keyword arguments as AssocNodes and AssocSplatNodes
              case PM_KEYWORD_HASH_NODE: {
                const pm_keyword_hash_node_t *keyword_arg = (const pm_keyword_hash_node_t *) argument;
                const pm_node_list_t *elements = &keyword_arg->elements;
 
                if (has_keyword_splat || has_splat) {
                    *flags |= VM_CALL_KW_SPLAT;
                    has_keyword_splat = true;
 
                    if (elements->size > 1 || !(elements->size == 1 && PM_NODE_TYPE_P(elements->nodes[0], PM_ASSOC_SPLAT_NODE))) {
                        // A new hash will be created for the keyword arguments
                        // in this case, so mark the method as passing mutable
                        // keyword splat.
                        *flags |= VM_CALL_KW_SPLAT_MUT;
                        pm_compile_hash_elements(iseq, argument, elements, 0, Qundef, true, ret, scope_node);
                    }
                    else if (*dup_rest & DUP_SINGLE_KW_SPLAT) {
                        *flags |= VM_CALL_KW_SPLAT_MUT;
                        PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
                        PUSH_INSN1(ret, location, newhash, INT2FIX(0));
                        pm_compile_hash_elements(iseq, argument, elements, 0, Qundef, true, ret, scope_node);
                        PUSH_SEND(ret, location, id_core_hash_merge_kwd, INT2FIX(2));
                    }
                    else {
                        pm_compile_hash_elements(iseq, argument, elements, 0, Qundef, true, ret, scope_node);
                    }
                }
                else {
                    // We need to first figure out if all elements of the
                    // KeywordHashNode are AssocNodes with symbol keys.
                    if (PM_NODE_FLAG_P(keyword_arg, PM_KEYWORD_HASH_NODE_FLAGS_SYMBOL_KEYS)) {
                        // If they are all symbol keys then we can pass them as
                        // keyword arguments. The first thing we need to do is
                        // deduplicate. We'll do this using the combination of a
                        // Ruby hash and a Ruby array.
                        VALUE stored_indices = rb_hash_new();
                        VALUE keyword_indices = rb_ary_new_capa(elements->size);
 
                        size_t size = 0;
                        for (size_t element_index = 0; element_index < elements->size; element_index++) {
                            const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) elements->nodes[element_index];
 
                            // Retrieve the stored index from the hash for this
                            // keyword.
                            VALUE keyword = pm_static_literal_value(iseq, assoc->key, scope_node);
                            VALUE stored_index = rb_hash_aref(stored_indices, keyword);
 
                            // If this keyword was already seen in the hash,
                            // then mark the array at that index as false and
                            // decrement the keyword size.
                            if (!NIL_P(stored_index)) {
                                rb_ary_store(keyword_indices, NUM2LONG(stored_index), Qfalse);
                                size--;
                            }
 
                            // Store (and possibly overwrite) the index for this
                            // keyword in the hash, mark the array at that index
                            // as true, and increment the keyword size.
                            rb_hash_aset(stored_indices, keyword, ULONG2NUM(element_index));
                            rb_ary_store(keyword_indices, (long) element_index, Qtrue);
                            size++;
                        }
 
                        if (size > VM_CALL_KW_LEN_MAX) {
                            COMPILE_ERROR(iseq, node_location->line, "too many keyword arguments (%d, maximum is %d)",
                                          (int) size, (int) VM_CALL_KW_LEN_MAX);
                        }
 
                        *kw_arg = rb_xmalloc_mul_add(size, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
                        *flags |= VM_CALL_KWARG;
 
                        VALUE *keywords = (*kw_arg)->keywords;
                        (*kw_arg)->references = 0;
                        (*kw_arg)->keyword_len = (int) size;
 
                        size_t keyword_index = 0;
                        for (size_t element_index = 0; element_index < elements->size; element_index++) {
                            const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) elements->nodes[element_index];
                            bool popped = true;
 
                            if (rb_ary_entry(keyword_indices, (long) element_index) == Qtrue) {
                                keywords[keyword_index++] = pm_static_literal_value(iseq, assoc->key, scope_node);
                                popped = false;
                            }
 
                            PM_COMPILE(assoc->value);
                        }
 
                        RUBY_ASSERT(keyword_index == size);
                    }
                    else {
                        // If they aren't all symbol keys then we need to
                        // construct a new hash and pass that as an argument.
                        orig_argc++;
                        *flags |= VM_CALL_KW_SPLAT;
 
                        size_t size = elements->size;
                        if (size > 1) {
                            // A new hash will be created for the keyword
                            // arguments in this case, so mark the method as
                            // passing mutable keyword splat.
                            *flags |= VM_CALL_KW_SPLAT_MUT;
                        }
 
                        for (size_t element_index = 0; element_index < size; element_index++) {
                            const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) elements->nodes[element_index];
                            PM_COMPILE_NOT_POPPED(assoc->key);
                            PM_COMPILE_NOT_POPPED(assoc->value);
                        }
 
                        PUSH_INSN1(ret, location, newhash, INT2FIX(size * 2));
                    }
                }
                break;
              }
              case PM_SPLAT_NODE: {
                *flags |= VM_CALL_ARGS_SPLAT;
                const pm_splat_node_t *splat_node = (const pm_splat_node_t *) argument;
 
                if (splat_node->expression) {
                    PM_COMPILE_NOT_POPPED(splat_node->expression);
                }
                else {
                    pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_MULT, 0);
                    PUSH_GETLOCAL(ret, location, index.index, index.level);
                }
 
                bool first_splat = !has_splat;
 
                if (first_splat) {
                    // If this is the first splat array seen and it's not the
                    // last parameter, we want splatarray to dup it.
                    //
                    // foo(a, *b, c)
                    //        ^^
                    if (index + 1 < arguments->size || has_regular_blockarg) {
                        PUSH_INSN1(ret, location, splatarray, (*dup_rest & SPLATARRAY_TRUE) ? Qtrue : Qfalse);
                        if (*dup_rest & SPLATARRAY_TRUE) *dup_rest &= ~SPLATARRAY_TRUE;
                    }
                    // If this is the first spalt array seen and it's the last
                    // parameter, we don't want splatarray to dup it.
                    //
                    // foo(a, *b)
                    //        ^^
                    else {
                        PUSH_INSN1(ret, location, splatarray, Qfalse);
                    }
                }
                else {
                    // If this is not the first splat array seen and it is also
                    // the last parameter, we don't want splatarray to dup it
                    // and we need to concat the array.
                    //
                    // foo(a, *b, *c)
                    //            ^^
                    PUSH_INSN(ret, location, concattoarray);
                }
 
                has_splat = true;
                post_splat_counter = 0;
 
                break;
              }
              case PM_FORWARDING_ARGUMENTS_NODE: { // not counted in argc return value
                iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
 
                if (ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->param.flags.forwardable) {
                    *flags |= VM_CALL_FORWARDING;
 
                    pm_local_index_t mult_local = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_DOT3, 0);
                    PUSH_GETLOCAL(ret, location, mult_local.index, mult_local.level);
 
                    break;
                }
 
                if (has_splat) {
                    // If we already have a splat, we're concatenating to existing array
                    orig_argc += 1;
                } else {
                    orig_argc += 2;
                }
 
                *flags |= VM_CALL_ARGS_SPLAT | VM_CALL_ARGS_BLOCKARG | VM_CALL_KW_SPLAT;
 
                // Forwarding arguments nodes are treated as foo(*, **, &)
                // So foo(...) equals foo(*, **, &) and as such the local
                // table for this method is known in advance
                //
                // Push the *
                pm_local_index_t mult_local = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_MULT, 0);
                PUSH_GETLOCAL(ret, location, mult_local.index, mult_local.level);
 
                if (has_splat) {
                    // If we already have a splat, we need to concatenate arrays
                    PUSH_INSN(ret, location, concattoarray);
                } else {
                    PUSH_INSN1(ret, location, splatarray, Qfalse);
                }
 
                // Push the **
                pm_local_index_t pow_local = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_POW, 0);
                PUSH_GETLOCAL(ret, location, pow_local.index, pow_local.level);
 
                // Push the &
                pm_local_index_t and_local = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_AND, 0);
                PUSH_INSN2(ret, location, getblockparamproxy, INT2FIX(and_local.index + VM_ENV_DATA_SIZE - 1), INT2FIX(and_local.level));
 
                break;
              }
              default: {
                post_splat_counter++;
                PM_COMPILE_NOT_POPPED(argument);
 
                // If we have a splat and we've seen a splat, we need to process
                // everything after the splat.
                if (has_splat) {
                    // Stack items are turned into an array and concatenated in
                    // the following cases:
                    //
                    // If the next node is a splat:
                    //
                    //   foo(*a, b, *c)
                    //
                    // If the next node is a kwarg or kwarg splat:
                    //
                    //   foo(*a, b, c: :d)
                    //   foo(*a, b, **c)
                    //
                    // If the next node is a forwarding argument:
                    //
                    //   foo(*a, b, ...)
                    //
                    // If the next node is NULL (we have hit the end):
                    //
                    //   foo(*a, b)
                    if (index == arguments->size - 1) {
                        RUBY_ASSERT(post_splat_counter > 0);
                        PUSH_INSN1(ret, location, pushtoarray, INT2FIX(post_splat_counter));
                    }
                    else {
                        pm_node_t *next_arg = arguments->nodes[index + 1];
 
                        switch (PM_NODE_TYPE(next_arg)) {
                          // A keyword hash node contains all keyword arguments as AssocNodes and AssocSplatNodes
                          case PM_KEYWORD_HASH_NODE: {
                            PUSH_INSN1(ret, location, newarray, INT2FIX(post_splat_counter));
                            PUSH_INSN(ret, location, concatarray);
                            break;
                          }
                          case PM_SPLAT_NODE: {
                            PUSH_INSN1(ret, location, newarray, INT2FIX(post_splat_counter));
                            PUSH_INSN(ret, location, concatarray);
                            break;
                          }
                          case PM_FORWARDING_ARGUMENTS_NODE: {
                            PUSH_INSN1(ret, location, pushtoarray, INT2FIX(post_splat_counter));
                            break;
                          }
                          default:
                            break;
                        }
                    }
                }
                else {
                    orig_argc++;
                }
              }
            }
        }
    }
 
    if (has_splat) orig_argc++;
    if (has_keyword_splat) orig_argc++;
    return orig_argc;
}
 
static inline bool
pm_setup_args_dup_rest_p(const pm_node_t *node)
{
    switch (PM_NODE_TYPE(node)) {
      case PM_BACK_REFERENCE_READ_NODE:
      case PM_CLASS_VARIABLE_READ_NODE:
      case PM_CONSTANT_READ_NODE:
      case PM_FALSE_NODE:
      case PM_FLOAT_NODE:
      case PM_GLOBAL_VARIABLE_READ_NODE:
      case PM_IMAGINARY_NODE:
      case PM_INSTANCE_VARIABLE_READ_NODE:
      case PM_INTEGER_NODE:
      case PM_LAMBDA_NODE:
      case PM_LOCAL_VARIABLE_READ_NODE:
      case PM_NIL_NODE:
      case PM_NUMBERED_REFERENCE_READ_NODE:
      case PM_RATIONAL_NODE:
      case PM_REGULAR_EXPRESSION_NODE:
      case PM_SELF_NODE:
      case PM_STRING_NODE:
      case PM_SYMBOL_NODE:
      case PM_TRUE_NODE:
        return false;
      case PM_CONSTANT_PATH_NODE: {
        const pm_constant_path_node_t *cast = (const pm_constant_path_node_t *) node;
        if (cast->parent != NULL) {
            return pm_setup_args_dup_rest_p(cast->parent);
        }
        return false;
      }
      case PM_IMPLICIT_NODE:
        return pm_setup_args_dup_rest_p(((const pm_implicit_node_t *) node)->value);
      case PM_ARRAY_NODE: {
        const pm_array_node_t *cast = (const pm_array_node_t *) node;
        for (size_t index = 0; index < cast->elements.size; index++) {
            if (pm_setup_args_dup_rest_p(cast->elements.nodes[index])) {
                return true;
            }
        }
        return false;
      }
      default:
        return true;
    }
}
 
static int
pm_setup_args(const pm_arguments_node_t *arguments_node, const pm_node_t *block, int *flags, struct rb_callinfo_kwarg **kw_arg, rb_iseq_t *iseq, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node, const pm_node_location_t *node_location)
{
    int dup_rest = SPLATARRAY_TRUE;
 
    const pm_node_list_t *arguments;
    size_t arguments_size;
 
    // Calls like foo(1, *f, **hash) that use splat and kwsplat could be
    // eligible for eliding duping the rest array (dup_reset=false).
    if (
        arguments_node != NULL &&
        (arguments = &arguments_node->arguments, arguments_size = arguments->size) >= 2 &&
        PM_NODE_FLAG_P(arguments_node, PM_ARGUMENTS_NODE_FLAGS_CONTAINS_SPLAT) &&
        !PM_NODE_FLAG_P(arguments_node, PM_ARGUMENTS_NODE_FLAGS_CONTAINS_MULTIPLE_SPLATS) &&
        PM_NODE_TYPE_P(arguments->nodes[arguments_size - 1], PM_KEYWORD_HASH_NODE)
    ) {
        // Start by assuming that dup_rest=false, then check each element of the
        // hash to ensure we don't need to flip it back to true (in case one of
        // the elements could potentially mutate the array).
        dup_rest = SPLATARRAY_FALSE;
 
        const pm_keyword_hash_node_t *keyword_hash = (const pm_keyword_hash_node_t *) arguments->nodes[arguments_size - 1];
        const pm_node_list_t *elements = &keyword_hash->elements;
 
        for (size_t index = 0; dup_rest == SPLATARRAY_FALSE && index < elements->size; index++) {
            const pm_node_t *element = elements->nodes[index];
 
            switch (PM_NODE_TYPE(element)) {
              case PM_ASSOC_NODE: {
                const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) element;
                if (pm_setup_args_dup_rest_p(assoc->key) || pm_setup_args_dup_rest_p(assoc->value)) dup_rest = SPLATARRAY_TRUE;
                break;
              }
              case PM_ASSOC_SPLAT_NODE: {
                const pm_assoc_splat_node_t *assoc = (const pm_assoc_splat_node_t *) element;
                if (assoc->value != NULL && pm_setup_args_dup_rest_p(assoc->value)) dup_rest = SPLATARRAY_TRUE;
                break;
              }
              default:
                break;
            }
        }
    }
 
    int initial_dup_rest = dup_rest;
    int argc;
 
    if (block && PM_NODE_TYPE_P(block, PM_BLOCK_ARGUMENT_NODE)) {
        // We compile the `&block_arg` expression first and stitch it later
        // since the nature of the expression influences whether splat should
        // duplicate the array.
        bool regular_block_arg = true;
        const pm_node_t *block_expr = ((const pm_block_argument_node_t *)block)->expression;
 
        if (block_expr && pm_setup_args_dup_rest_p(block_expr)) {
            dup_rest = SPLATARRAY_TRUE | DUP_SINGLE_KW_SPLAT;
            initial_dup_rest = dup_rest;
        }
 
        DECL_ANCHOR(block_arg);
        pm_compile_node(iseq, block, block_arg, false, scope_node);
 
        *flags |= VM_CALL_ARGS_BLOCKARG;
 
        if (LIST_INSN_SIZE_ONE(block_arg)) {
            LINK_ELEMENT *elem = FIRST_ELEMENT(block_arg);
            if (IS_INSN(elem)) {
                INSN *iobj = (INSN *) elem;
                if (iobj->insn_id == BIN(getblockparam)) {
                    iobj->insn_id = BIN(getblockparamproxy);
                }
 
                // Allow splat without duplication for simple one-instruction
                // block arguments like `&arg`. It is known that this
                // optimization can be too aggressive in some cases. See
                // [Bug #16504].
                regular_block_arg = false;
            }
        }
 
        argc = pm_setup_args_core(arguments_node, block, flags, regular_block_arg, kw_arg, &dup_rest, iseq, ret, scope_node, node_location);
        PUSH_SEQ(ret, block_arg);
    }
    else {
        argc = pm_setup_args_core(arguments_node, block, flags, false, kw_arg, &dup_rest, iseq, ret, scope_node, node_location);
    }
 
    // If the dup_rest flag was consumed while compiling the arguments (which
    // effectively means we found the splat node), then it would have changed
    // during the call to pm_setup_args_core. In this case, we want to add the
    // VM_CALL_ARGS_SPLAT_MUT flag.
    if (*flags & VM_CALL_ARGS_SPLAT && dup_rest != initial_dup_rest) {
        *flags |= VM_CALL_ARGS_SPLAT_MUT;
    }
 
    return argc;
}
 
static void
pm_compile_index_operator_write_node(rb_iseq_t *iseq, const pm_index_operator_write_node_t *node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    if (!popped) PUSH_INSN(ret, location, putnil);
 
    PM_COMPILE_NOT_POPPED(node->receiver);
 
    int boff = (node->block == NULL ? 0 : 1);
    int flag = PM_NODE_TYPE_P(node->receiver, PM_SELF_NODE) ? VM_CALL_FCALL : 0;
    struct rb_callinfo_kwarg *keywords = NULL;
    int argc = pm_setup_args(node->arguments, (const pm_node_t *) node->block, &flag, &keywords, iseq, ret, scope_node, node_location);
 
    if ((argc > 0 || boff) && (flag & VM_CALL_KW_SPLAT)) {
        if (boff) {
            PUSH_INSN(ret, location, splatkw);
        }
        else {
            PUSH_INSN(ret, location, dup);
            PUSH_INSN(ret, location, splatkw);
            PUSH_INSN(ret, location, pop);
        }
    }
 
    int dup_argn = argc + 1 + boff;
    int keyword_len = 0;
 
    if (keywords) {
        keyword_len = keywords->keyword_len;
        dup_argn += keyword_len;
    }
 
    PUSH_INSN1(ret, location, dupn, INT2FIX(dup_argn));
    PUSH_SEND_R(ret, location, idAREF, INT2FIX(argc), NULL, INT2FIX(flag & ~(VM_CALL_ARGS_SPLAT_MUT | VM_CALL_KW_SPLAT_MUT)), keywords);
    PM_COMPILE_NOT_POPPED(node->value);
 
    ID id_operator = pm_constant_id_lookup(scope_node, node->binary_operator);
    PUSH_SEND(ret, location, id_operator, INT2FIX(1));
 
    if (!popped) {
        PUSH_INSN1(ret, location, setn, INT2FIX(dup_argn + 1));
    }
    if (flag & VM_CALL_ARGS_SPLAT) {
        if (flag & VM_CALL_KW_SPLAT) {
            PUSH_INSN1(ret, location, topn, INT2FIX(2 + boff));
 
            if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
                PUSH_INSN1(ret, location, splatarray, Qtrue);
                flag |= VM_CALL_ARGS_SPLAT_MUT;
            }
 
            PUSH_INSN(ret, location, swap);
            PUSH_INSN1(ret, location, pushtoarray, INT2FIX(1));
            PUSH_INSN1(ret, location, setn, INT2FIX(2 + boff));
            PUSH_INSN(ret, location, pop);
        }
        else {
            if (boff > 0) {
                PUSH_INSN1(ret, location, dupn, INT2FIX(3));
                PUSH_INSN(ret, location, swap);
                PUSH_INSN(ret, location, pop);
            }
            if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
                PUSH_INSN(ret, location, swap);
                PUSH_INSN1(ret, location, splatarray, Qtrue);
                PUSH_INSN(ret, location, swap);
                flag |= VM_CALL_ARGS_SPLAT_MUT;
            }
            PUSH_INSN1(ret, location, pushtoarray, INT2FIX(1));
            if (boff > 0) {
                PUSH_INSN1(ret, location, setn, INT2FIX(3));
                PUSH_INSN(ret, location, pop);
                PUSH_INSN(ret, location, pop);
            }
        }
 
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc), NULL, INT2FIX(flag), keywords);
    }
    else if (flag & VM_CALL_KW_SPLAT) {
        if (boff > 0) {
            PUSH_INSN1(ret, location, topn, INT2FIX(2));
            PUSH_INSN(ret, location, swap);
            PUSH_INSN1(ret, location, setn, INT2FIX(3));
            PUSH_INSN(ret, location, pop);
        }
        PUSH_INSN(ret, location, swap);
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc + 1), NULL, INT2FIX(flag), keywords);
    }
    else if (keyword_len) {
        PUSH_INSN(ret, location, dup);
        PUSH_INSN1(ret, location, opt_reverse, INT2FIX(keyword_len + boff + 2));
        PUSH_INSN1(ret, location, opt_reverse, INT2FIX(keyword_len + boff + 1));
        PUSH_INSN(ret, location, pop);
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc + 1), NULL, INT2FIX(flag), keywords);
    }
    else {
        if (boff > 0) {
            PUSH_INSN(ret, location, swap);
        }
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc + 1), NULL, INT2FIX(flag), keywords);
    }
 
    PUSH_INSN(ret, location, pop);
}
 
static void
pm_compile_index_control_flow_write_node(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_t *receiver, const pm_arguments_node_t *arguments, const pm_block_argument_node_t *block, const pm_node_t *value, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    if (!popped) PUSH_INSN(ret, location, putnil);
    PM_COMPILE_NOT_POPPED(receiver);
 
    int boff = (block == NULL ? 0 : 1);
    int flag = PM_NODE_TYPE_P(receiver, PM_SELF_NODE) ? VM_CALL_FCALL : 0;
    struct rb_callinfo_kwarg *keywords = NULL;
    int argc = pm_setup_args(arguments, (const pm_node_t *) block, &flag, &keywords, iseq, ret, scope_node, node_location);
 
    if ((argc > 0 || boff) && (flag & VM_CALL_KW_SPLAT)) {
        if (boff) {
            PUSH_INSN(ret, location, splatkw);
        }
        else {
            PUSH_INSN(ret, location, dup);
            PUSH_INSN(ret, location, splatkw);
            PUSH_INSN(ret, location, pop);
        }
    }
 
    int dup_argn = argc + 1 + boff;
    int keyword_len = 0;
 
    if (keywords) {
        keyword_len = keywords->keyword_len;
        dup_argn += keyword_len;
    }
 
    PUSH_INSN1(ret, location, dupn, INT2FIX(dup_argn));
    PUSH_SEND_R(ret, location, idAREF, INT2FIX(argc), NULL, INT2FIX(flag & ~(VM_CALL_ARGS_SPLAT_MUT | VM_CALL_KW_SPLAT_MUT)), keywords);
 
    LABEL *label = NEW_LABEL(location.line);
    LABEL *lfin = NEW_LABEL(location.line);
 
    PUSH_INSN(ret, location, dup);
    if (PM_NODE_TYPE_P(node, PM_INDEX_AND_WRITE_NODE)) {
        PUSH_INSNL(ret, location, branchunless, label);
    }
    else {
        PUSH_INSNL(ret, location, branchif, label);
    }
 
    PUSH_INSN(ret, location, pop);
    PM_COMPILE_NOT_POPPED(value);
 
    if (!popped) {
        PUSH_INSN1(ret, location, setn, INT2FIX(dup_argn + 1));
    }
 
    if (flag & VM_CALL_ARGS_SPLAT) {
        if (flag & VM_CALL_KW_SPLAT) {
            PUSH_INSN1(ret, location, topn, INT2FIX(2 + boff));
            if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
                PUSH_INSN1(ret, location, splatarray, Qtrue);
                flag |= VM_CALL_ARGS_SPLAT_MUT;
            }
 
            PUSH_INSN(ret, location, swap);
            PUSH_INSN1(ret, location, pushtoarray, INT2FIX(1));
            PUSH_INSN1(ret, location, setn, INT2FIX(2 + boff));
            PUSH_INSN(ret, location, pop);
        }
        else {
            if (boff > 0) {
                PUSH_INSN1(ret, location, dupn, INT2FIX(3));
                PUSH_INSN(ret, location, swap);
                PUSH_INSN(ret, location, pop);
            }
            if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
                PUSH_INSN(ret, location, swap);
                PUSH_INSN1(ret, location, splatarray, Qtrue);
                PUSH_INSN(ret, location, swap);
                flag |= VM_CALL_ARGS_SPLAT_MUT;
            }
            PUSH_INSN1(ret, location, pushtoarray, INT2FIX(1));
            if (boff > 0) {
                PUSH_INSN1(ret, location, setn, INT2FIX(3));
                PUSH_INSN(ret, location, pop);
                PUSH_INSN(ret, location, pop);
            }
        }
 
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc), NULL, INT2FIX(flag), keywords);
    }
    else if (flag & VM_CALL_KW_SPLAT) {
        if (boff > 0) {
            PUSH_INSN1(ret, location, topn, INT2FIX(2));
            PUSH_INSN(ret, location, swap);
            PUSH_INSN1(ret, location, setn, INT2FIX(3));
            PUSH_INSN(ret, location, pop);
        }
 
        PUSH_INSN(ret, location, swap);
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc + 1), NULL, INT2FIX(flag), keywords);
    }
    else if (keyword_len) {
        PUSH_INSN1(ret, location, opt_reverse, INT2FIX(keyword_len + boff + 1));
        PUSH_INSN1(ret, location, opt_reverse, INT2FIX(keyword_len + boff + 0));
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc + 1), NULL, INT2FIX(flag), keywords);
    }
    else {
        if (boff > 0) {
            PUSH_INSN(ret, location, swap);
        }
        PUSH_SEND_R(ret, location, idASET, INT2FIX(argc + 1), NULL, INT2FIX(flag), keywords);
    }
 
    PUSH_INSN(ret, location, pop);
    PUSH_INSNL(ret, location, jump, lfin);
    PUSH_LABEL(ret, label);
    if (!popped) {
        PUSH_INSN1(ret, location, setn, INT2FIX(dup_argn + 1));
    }
    PUSH_INSN1(ret, location, adjuststack, INT2FIX(dup_argn + 1));
    PUSH_LABEL(ret, lfin);
}
 
// When we compile a pattern matching expression, we use the stack as a scratch
// space to store lots of different values (consider it like we have a pattern
// matching function and we need space for a bunch of different local
// variables). The "base index" refers to the index on the stack where we
// started compiling the pattern matching expression. These offsets from that
// base index indicate the location of the various locals we need.
#define PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE 0
#define PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING 1
#define PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P 2
#define PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_MATCHEE 3
#define PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_KEY 4
 
// A forward declaration because this is the recursive function that handles
// compiling a pattern. It can be reentered by nesting patterns, as in the case
// of arrays or hashes.
static int pm_compile_pattern(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, LABEL *matched_label, LABEL *unmatched_label, bool in_single_pattern, bool use_deconstructed_cache, unsigned int base_index);
 
static int
pm_compile_pattern_generic_error(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, VALUE message, unsigned int base_index)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    LABEL *match_succeeded_label = NEW_LABEL(location.line);
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSNL(ret, location, branchif, match_succeeded_label);
 
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
    PUSH_INSN1(ret, location, putobject, message);
    PUSH_INSN1(ret, location, topn, INT2FIX(3));
    PUSH_SEND(ret, location, id_core_sprintf, INT2FIX(2));
    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 1));
 
    PUSH_INSN1(ret, location, putobject, Qfalse);
    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 2));
 
    PUSH_INSN(ret, location, pop);
    PUSH_INSN(ret, location, pop);
    PUSH_LABEL(ret, match_succeeded_label);
 
    return COMPILE_OK;
}
 
static int
pm_compile_pattern_length_error(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, VALUE message, VALUE length, unsigned int base_index)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    LABEL *match_succeeded_label = NEW_LABEL(location.line);
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSNL(ret, location, branchif, match_succeeded_label);
 
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
    PUSH_INSN1(ret, location, putobject, message);
    PUSH_INSN1(ret, location, topn, INT2FIX(3));
    PUSH_INSN(ret, location, dup);
    PUSH_SEND(ret, location, idLength, INT2FIX(0));
    PUSH_INSN1(ret, location, putobject, length);
    PUSH_SEND(ret, location, id_core_sprintf, INT2FIX(4));
    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 1));
 
    PUSH_INSN1(ret, location, putobject, Qfalse);
    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 2));
 
    PUSH_INSN(ret, location, pop);
    PUSH_INSN(ret, location, pop);
    PUSH_LABEL(ret, match_succeeded_label);
 
    return COMPILE_OK;
}
 
static int
pm_compile_pattern_eqq_error(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, unsigned int base_index)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    LABEL *match_succeeded_label = NEW_LABEL(location.line);
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSNL(ret, location, branchif, match_succeeded_label);
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
    VALUE operand = rb_fstring_lit("%p === %p does not return true");
    PUSH_INSN1(ret, location, putobject, operand);
 
    PUSH_INSN1(ret, location, topn, INT2FIX(3));
    PUSH_INSN1(ret, location, topn, INT2FIX(5));
    PUSH_SEND(ret, location, id_core_sprintf, INT2FIX(3));
    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 1));
    PUSH_INSN1(ret, location, putobject, Qfalse);
    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 2));
    PUSH_INSN(ret, location, pop);
    PUSH_INSN(ret, location, pop);
 
    PUSH_LABEL(ret, match_succeeded_label);
    PUSH_INSN1(ret, location, setn, INT2FIX(2));
    PUSH_INSN(ret, location, pop);
    PUSH_INSN(ret, location, pop);
 
    return COMPILE_OK;
}
 
static int
pm_compile_pattern_match(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, LABEL *unmatched_label, bool in_single_pattern, bool use_deconstructed_cache, unsigned int base_index)
{
    LABEL *matched_label = NEW_LABEL(pm_node_line_number_cached(node, scope_node));
    CHECK(pm_compile_pattern(iseq, scope_node, node, ret, matched_label, unmatched_label, in_single_pattern, use_deconstructed_cache, base_index));
    PUSH_LABEL(ret, matched_label);
    return COMPILE_OK;
}
 
static int
pm_compile_pattern_deconstruct(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, LABEL *deconstruct_label, LABEL *match_failed_label, LABEL *deconstructed_label, LABEL *type_error_label, bool in_single_pattern, bool use_deconstructed_cache, unsigned int base_index)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    if (use_deconstructed_cache) {
        PUSH_INSN1(ret, location, topn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE));
        PUSH_INSNL(ret, location, branchnil, deconstruct_label);
 
        PUSH_INSN1(ret, location, topn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE));
        PUSH_INSNL(ret, location, branchunless, match_failed_label);
 
        PUSH_INSN(ret, location, pop);
        PUSH_INSN1(ret, location, topn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE - 1));
        PUSH_INSNL(ret, location, jump, deconstructed_label);
    }
    else {
        PUSH_INSNL(ret, location, jump, deconstruct_label);
    }
 
    PUSH_LABEL(ret, deconstruct_label);
    PUSH_INSN(ret, location, dup);
 
    VALUE operand = ID2SYM(rb_intern("deconstruct"));
    PUSH_INSN1(ret, location, putobject, operand);
    PUSH_SEND(ret, location, idRespond_to, INT2FIX(1));
 
    if (use_deconstructed_cache) {
        PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE + 1));
    }
 
    if (in_single_pattern) {
        CHECK(pm_compile_pattern_generic_error(iseq, scope_node, node, ret, rb_fstring_lit("%p does not respond to #deconstruct"), base_index + 1));
    }
 
    PUSH_INSNL(ret, location, branchunless, match_failed_label);
    PUSH_SEND(ret, location, rb_intern("deconstruct"), INT2FIX(0));
 
    if (use_deconstructed_cache) {
        PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE));
    }
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, checktype, INT2FIX(T_ARRAY));
    PUSH_INSNL(ret, location, branchunless, type_error_label);
    PUSH_LABEL(ret, deconstructed_label);
 
    return COMPILE_OK;
}
 
static int
pm_compile_pattern_constant(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, LABEL *match_failed_label, bool in_single_pattern, unsigned int base_index)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    PUSH_INSN(ret, location, dup);
    PM_COMPILE_NOT_POPPED(node);
 
    if (in_single_pattern) {
        PUSH_INSN1(ret, location, dupn, INT2FIX(2));
    }
    PUSH_INSN1(ret, location, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_CASE));
    if (in_single_pattern) {
        CHECK(pm_compile_pattern_eqq_error(iseq, scope_node, node, ret, base_index + 3));
    }
    PUSH_INSNL(ret, location, branchunless, match_failed_label);
    return COMPILE_OK;
}
 
static void
pm_compile_pattern_error_handler(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, LABEL *done_label, bool popped)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    LABEL *key_error_label = NEW_LABEL(location.line);
    LABEL *cleanup_label = NEW_LABEL(location.line);
 
    struct rb_callinfo_kwarg *kw_arg = rb_xmalloc_mul_add(2, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
    kw_arg->references = 0;
    kw_arg->keyword_len = 2;
    kw_arg->keywords[0] = ID2SYM(rb_intern("matchee"));
    kw_arg->keywords[1] = ID2SYM(rb_intern("key"));
 
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
    PUSH_INSN1(ret, location, topn, INT2FIX(PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 2));
    PUSH_INSNL(ret, location, branchif, key_error_label);
 
    PUSH_INSN1(ret, location, putobject, rb_eNoMatchingPatternError);
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
    {
        VALUE operand = rb_fstring_lit("%p: %s");
        PUSH_INSN1(ret, location, putobject, operand);
    }
 
    PUSH_INSN1(ret, location, topn, INT2FIX(4));
    PUSH_INSN1(ret, location, topn, INT2FIX(PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 6));
    PUSH_SEND(ret, location, id_core_sprintf, INT2FIX(3));
    PUSH_SEND(ret, location, id_core_raise, INT2FIX(2));
    PUSH_INSNL(ret, location, jump, cleanup_label);
 
    PUSH_LABEL(ret, key_error_label);
    PUSH_INSN1(ret, location, putobject, rb_eNoMatchingPatternKeyError);
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
    {
        VALUE operand = rb_fstring_lit("%p: %s");
        PUSH_INSN1(ret, location, putobject, operand);
    }
 
    PUSH_INSN1(ret, location, topn, INT2FIX(4));
    PUSH_INSN1(ret, location, topn, INT2FIX(PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 6));
    PUSH_SEND(ret, location, id_core_sprintf, INT2FIX(3));
    PUSH_INSN1(ret, location, topn, INT2FIX(PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_MATCHEE + 4));
    PUSH_INSN1(ret, location, topn, INT2FIX(PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_KEY + 5));
    PUSH_SEND_R(ret, location, rb_intern("new"), INT2FIX(1), NULL, INT2FIX(VM_CALL_KWARG), kw_arg);
    PUSH_SEND(ret, location, id_core_raise, INT2FIX(1));
    PUSH_LABEL(ret, cleanup_label);
 
    PUSH_INSN1(ret, location, adjuststack, INT2FIX(7));
    if (!popped) PUSH_INSN(ret, location, putnil);
    PUSH_INSNL(ret, location, jump, done_label);
    PUSH_INSN1(ret, location, dupn, INT2FIX(5));
    if (popped) PUSH_INSN(ret, location, putnil);
}
 
static int
pm_compile_pattern(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_t *node, LINK_ANCHOR *const ret, LABEL *matched_label, LABEL *unmatched_label, bool in_single_pattern, bool use_deconstructed_cache, unsigned int base_index)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    switch (PM_NODE_TYPE(node)) {
      case PM_ARRAY_PATTERN_NODE: {
        // Array patterns in pattern matching are triggered by using commas in
        // a pattern or wrapping it in braces. They are represented by a
        // ArrayPatternNode. This looks like:
        //
        //     foo => [1, 2, 3]
        //
        // It can optionally have a splat in the middle of it, which can
        // optionally have a name attached.
        const pm_array_pattern_node_t *cast = (const pm_array_pattern_node_t *) node;
 
        const size_t requireds_size = cast->requireds.size;
        const size_t posts_size = cast->posts.size;
        const size_t minimum_size = requireds_size + posts_size;
 
        bool rest_named = false;
        bool use_rest_size = false;
 
        if (cast->rest != NULL) {
            rest_named = (PM_NODE_TYPE_P(cast->rest, PM_SPLAT_NODE) && ((const pm_splat_node_t *) cast->rest)->expression != NULL);
            use_rest_size = (rest_named || (!rest_named && posts_size > 0));
        }
 
        LABEL *match_failed_label = NEW_LABEL(location.line);
        LABEL *type_error_label = NEW_LABEL(location.line);
        LABEL *deconstruct_label = NEW_LABEL(location.line);
        LABEL *deconstructed_label = NEW_LABEL(location.line);
 
        if (use_rest_size) {
            PUSH_INSN1(ret, location, putobject, INT2FIX(0));
            PUSH_INSN(ret, location, swap);
            base_index++;
        }
 
        if (cast->constant != NULL) {
            CHECK(pm_compile_pattern_constant(iseq, scope_node, cast->constant, ret, match_failed_label, in_single_pattern, base_index));
        }
 
        CHECK(pm_compile_pattern_deconstruct(iseq, scope_node, node, ret, deconstruct_label, match_failed_label, deconstructed_label, type_error_label, in_single_pattern, use_deconstructed_cache, base_index));
 
        PUSH_INSN(ret, location, dup);
        PUSH_SEND(ret, location, idLength, INT2FIX(0));
        PUSH_INSN1(ret, location, putobject, INT2FIX(minimum_size));
        PUSH_SEND(ret, location, cast->rest == NULL ? idEq : idGE, INT2FIX(1));
        if (in_single_pattern) {
            VALUE message = cast->rest == NULL ? rb_fstring_lit("%p length mismatch (given %p, expected %p)") : rb_fstring_lit("%p length mismatch (given %p, expected %p+)");
            CHECK(pm_compile_pattern_length_error(iseq, scope_node, node, ret, message, INT2FIX(minimum_size), base_index + 1));
        }
        PUSH_INSNL(ret, location, branchunless, match_failed_label);
 
        for (size_t index = 0; index < requireds_size; index++) {
            const pm_node_t *required = cast->requireds.nodes[index];
            PUSH_INSN(ret, location, dup);
            PUSH_INSN1(ret, location, putobject, INT2FIX(index));
            PUSH_SEND(ret, location, idAREF, INT2FIX(1));
            CHECK(pm_compile_pattern_match(iseq, scope_node, required, ret, match_failed_label, in_single_pattern, false, base_index + 1));
        }
 
        if (cast->rest != NULL) {
            if (rest_named) {
                PUSH_INSN(ret, location, dup);
                PUSH_INSN1(ret, location, putobject, INT2FIX(requireds_size));
                PUSH_INSN1(ret, location, topn, INT2FIX(1));
                PUSH_SEND(ret, location, idLength, INT2FIX(0));
                PUSH_INSN1(ret, location, putobject, INT2FIX(minimum_size));
                PUSH_SEND(ret, location, idMINUS, INT2FIX(1));
                PUSH_INSN1(ret, location, setn, INT2FIX(4));
                PUSH_SEND(ret, location, idAREF, INT2FIX(2));
                CHECK(pm_compile_pattern_match(iseq, scope_node, ((const pm_splat_node_t *) cast->rest)->expression, ret, match_failed_label, in_single_pattern, false, base_index + 1));
            }
            else if (posts_size > 0) {
                PUSH_INSN(ret, location, dup);
                PUSH_SEND(ret, location, idLength, INT2FIX(0));
                PUSH_INSN1(ret, location, putobject, INT2FIX(minimum_size));
                PUSH_SEND(ret, location, idMINUS, INT2FIX(1));
                PUSH_INSN1(ret, location, setn, INT2FIX(2));
                PUSH_INSN(ret, location, pop);
            }
        }
 
        for (size_t index = 0; index < posts_size; index++) {
            const pm_node_t *post = cast->posts.nodes[index];
            PUSH_INSN(ret, location, dup);
 
            PUSH_INSN1(ret, location, putobject, INT2FIX(requireds_size + index));
            PUSH_INSN1(ret, location, topn, INT2FIX(3));
            PUSH_SEND(ret, location, idPLUS, INT2FIX(1));
            PUSH_SEND(ret, location, idAREF, INT2FIX(1));
            CHECK(pm_compile_pattern_match(iseq, scope_node, post, ret, match_failed_label, in_single_pattern, false, base_index + 1));
        }
 
        PUSH_INSN(ret, location, pop);
        if (use_rest_size) {
            PUSH_INSN(ret, location, pop);
        }
 
        PUSH_INSNL(ret, location, jump, matched_label);
        PUSH_INSN(ret, location, putnil);
        if (use_rest_size) {
            PUSH_INSN(ret, location, putnil);
        }
 
        PUSH_LABEL(ret, type_error_label);
        PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
        PUSH_INSN1(ret, location, putobject, rb_eTypeError);
 
        {
            VALUE operand = rb_fstring_lit("deconstruct must return Array");
            PUSH_INSN1(ret, location, putobject, operand);
        }
 
        PUSH_SEND(ret, location, id_core_raise, INT2FIX(2));
        PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, match_failed_label);
        PUSH_INSN(ret, location, pop);
        if (use_rest_size) {
            PUSH_INSN(ret, location, pop);
        }
 
        PUSH_INSNL(ret, location, jump, unmatched_label);
        break;
      }
      case PM_FIND_PATTERN_NODE: {
        // Find patterns in pattern matching are triggered by using commas in
        // a pattern or wrapping it in braces and using a splat on both the left
        // and right side of the pattern. This looks like:
        //
        //     foo => [*, 1, 2, 3, *]
        //
        // There can be any number of requireds in the middle. The splats on
        // both sides can optionally have names attached.
        const pm_find_pattern_node_t *cast = (const pm_find_pattern_node_t *) node;
        const size_t size = cast->requireds.size;
 
        LABEL *match_failed_label = NEW_LABEL(location.line);
        LABEL *type_error_label = NEW_LABEL(location.line);
        LABEL *deconstruct_label = NEW_LABEL(location.line);
        LABEL *deconstructed_label = NEW_LABEL(location.line);
 
        if (cast->constant) {
            CHECK(pm_compile_pattern_constant(iseq, scope_node, cast->constant, ret, match_failed_label, in_single_pattern, base_index));
        }
 
        CHECK(pm_compile_pattern_deconstruct(iseq, scope_node, node, ret, deconstruct_label, match_failed_label, deconstructed_label, type_error_label, in_single_pattern, use_deconstructed_cache, base_index));
 
        PUSH_INSN(ret, location, dup);
        PUSH_SEND(ret, location, idLength, INT2FIX(0));
        PUSH_INSN1(ret, location, putobject, INT2FIX(size));
        PUSH_SEND(ret, location, idGE, INT2FIX(1));
        if (in_single_pattern) {
            CHECK(pm_compile_pattern_length_error(iseq, scope_node, node, ret, rb_fstring_lit("%p length mismatch (given %p, expected %p+)"), INT2FIX(size), base_index + 1));
        }
        PUSH_INSNL(ret, location, branchunless, match_failed_label);
 
        {
            LABEL *while_begin_label = NEW_LABEL(location.line);
            LABEL *next_loop_label = NEW_LABEL(location.line);
            LABEL *find_succeeded_label = NEW_LABEL(location.line);
            LABEL *find_failed_label = NEW_LABEL(location.line);
 
            PUSH_INSN(ret, location, dup);
            PUSH_SEND(ret, location, idLength, INT2FIX(0));
 
            PUSH_INSN(ret, location, dup);
            PUSH_INSN1(ret, location, putobject, INT2FIX(size));
            PUSH_SEND(ret, location, idMINUS, INT2FIX(1));
            PUSH_INSN1(ret, location, putobject, INT2FIX(0));
            PUSH_LABEL(ret, while_begin_label);
 
            PUSH_INSN(ret, location, dup);
            PUSH_INSN1(ret, location, topn, INT2FIX(2));
            PUSH_SEND(ret, location, idLE, INT2FIX(1));
            PUSH_INSNL(ret, location, branchunless, find_failed_label);
 
            for (size_t index = 0; index < size; index++) {
                PUSH_INSN1(ret, location, topn, INT2FIX(3));
                PUSH_INSN1(ret, location, topn, INT2FIX(1));
 
                if (index != 0) {
                    PUSH_INSN1(ret, location, putobject, INT2FIX(index));
                    PUSH_SEND(ret, location, idPLUS, INT2FIX(1));
                }
 
                PUSH_SEND(ret, location, idAREF, INT2FIX(1));
                CHECK(pm_compile_pattern_match(iseq, scope_node, cast->requireds.nodes[index], ret, next_loop_label, in_single_pattern, false, base_index + 4));
            }
 
            const pm_splat_node_t *left = cast->left;
 
            if (left->expression != NULL) {
                PUSH_INSN1(ret, location, topn, INT2FIX(3));
                PUSH_INSN1(ret, location, putobject, INT2FIX(0));
                PUSH_INSN1(ret, location, topn, INT2FIX(2));
                PUSH_SEND(ret, location, idAREF, INT2FIX(2));
                CHECK(pm_compile_pattern_match(iseq, scope_node, left->expression, ret, find_failed_label, in_single_pattern, false, base_index + 4));
            }
 
            const pm_splat_node_t *right = cast->right;
 
            if (right->expression != NULL) {
                PUSH_INSN1(ret, location, topn, INT2FIX(3));
                PUSH_INSN1(ret, location, topn, INT2FIX(1));
                PUSH_INSN1(ret, location, putobject, INT2FIX(size));
                PUSH_SEND(ret, location, idPLUS, INT2FIX(1));
                PUSH_INSN1(ret, location, topn, INT2FIX(3));
                PUSH_SEND(ret, location, idAREF, INT2FIX(2));
                pm_compile_pattern_match(iseq, scope_node, right->expression, ret, find_failed_label, in_single_pattern, false, base_index + 4);
            }
 
            PUSH_INSNL(ret, location, jump, find_succeeded_label);
 
            PUSH_LABEL(ret, next_loop_label);
            PUSH_INSN1(ret, location, putobject, INT2FIX(1));
            PUSH_SEND(ret, location, idPLUS, INT2FIX(1));
            PUSH_INSNL(ret, location, jump, while_begin_label);
 
            PUSH_LABEL(ret, find_failed_label);
            PUSH_INSN1(ret, location, adjuststack, INT2FIX(3));
            if (in_single_pattern) {
                PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
                {
                    VALUE operand = rb_fstring_lit("%p does not match to find pattern");
                    PUSH_INSN1(ret, location, putobject, operand);
                }
 
                PUSH_INSN1(ret, location, topn, INT2FIX(2));
                PUSH_SEND(ret, location, id_core_sprintf, INT2FIX(2));
                PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 1));
 
                PUSH_INSN1(ret, location, putobject, Qfalse);
                PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 2));
 
                PUSH_INSN(ret, location, pop);
                PUSH_INSN(ret, location, pop);
            }
            PUSH_INSNL(ret, location, jump, match_failed_label);
            PUSH_INSN1(ret, location, dupn, INT2FIX(3));
 
            PUSH_LABEL(ret, find_succeeded_label);
            PUSH_INSN1(ret, location, adjuststack, INT2FIX(3));
        }
 
        PUSH_INSN(ret, location, pop);
        PUSH_INSNL(ret, location, jump, matched_label);
        PUSH_INSN(ret, location, putnil);
 
        PUSH_LABEL(ret, type_error_label);
        PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
        PUSH_INSN1(ret, location, putobject, rb_eTypeError);
 
        {
            VALUE operand = rb_fstring_lit("deconstruct must return Array");
            PUSH_INSN1(ret, location, putobject, operand);
        }
 
        PUSH_SEND(ret, location, id_core_raise, INT2FIX(2));
        PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, match_failed_label);
        PUSH_INSN(ret, location, pop);
        PUSH_INSNL(ret, location, jump, unmatched_label);
 
        break;
      }
      case PM_HASH_PATTERN_NODE: {
        // Hash patterns in pattern matching are triggered by using labels and
        // values in a pattern or by using the ** operator. They are represented
        // by the HashPatternNode. This looks like:
        //
        //     foo => { a: 1, b: 2, **bar }
        //
        // It can optionally have an assoc splat in the middle of it, which can
        // optionally have a name.
        const pm_hash_pattern_node_t *cast = (const pm_hash_pattern_node_t *) node;
 
        // We don't consider it a "rest" parameter if it's a ** that is unnamed.
        bool has_rest = cast->rest != NULL && !(PM_NODE_TYPE_P(cast->rest, PM_ASSOC_SPLAT_NODE) && ((const pm_assoc_splat_node_t *) cast->rest)->value == NULL);
        bool has_keys = cast->elements.size > 0 || cast->rest != NULL;
 
        LABEL *match_failed_label = NEW_LABEL(location.line);
        LABEL *type_error_label = NEW_LABEL(location.line);
        VALUE keys = Qnil;
 
        if (has_keys && !has_rest) {
            keys = rb_ary_new_capa(cast->elements.size);
 
            for (size_t index = 0; index < cast->elements.size; index++) {
                const pm_node_t *element = cast->elements.nodes[index];
                RUBY_ASSERT(PM_NODE_TYPE_P(element, PM_ASSOC_NODE));
 
                const pm_node_t *key = ((const pm_assoc_node_t *) element)->key;
                RUBY_ASSERT(PM_NODE_TYPE_P(key, PM_SYMBOL_NODE));
 
                VALUE symbol = ID2SYM(parse_string_symbol(scope_node, (const pm_symbol_node_t *) key));
                rb_ary_push(keys, symbol);
            }
        }
 
        if (cast->constant) {
            CHECK(pm_compile_pattern_constant(iseq, scope_node, cast->constant, ret, match_failed_label, in_single_pattern, base_index));
        }
 
        PUSH_INSN(ret, location, dup);
 
        {
            VALUE operand = ID2SYM(rb_intern("deconstruct_keys"));
            PUSH_INSN1(ret, location, putobject, operand);
        }
 
        PUSH_SEND(ret, location, idRespond_to, INT2FIX(1));
        if (in_single_pattern) {
            CHECK(pm_compile_pattern_generic_error(iseq, scope_node, node, ret, rb_fstring_lit("%p does not respond to #deconstruct_keys"), base_index + 1));
        }
        PUSH_INSNL(ret, location, branchunless, match_failed_label);
 
        if (NIL_P(keys)) {
            PUSH_INSN(ret, location, putnil);
        }
        else {
            rb_obj_hide(keys);
            RB_OBJ_SET_FROZEN_SHAREABLE(keys);
            PUSH_INSN1(ret, location, duparray, keys);
            RB_OBJ_WRITTEN(iseq, Qundef, keys);
        }
        PUSH_SEND(ret, location, rb_intern("deconstruct_keys"), INT2FIX(1));
 
        PUSH_INSN(ret, location, dup);
        PUSH_INSN1(ret, location, checktype, INT2FIX(T_HASH));
        PUSH_INSNL(ret, location, branchunless, type_error_label);
 
        if (has_rest) {
            PUSH_SEND(ret, location, rb_intern("dup"), INT2FIX(0));
        }
 
        if (has_keys) {
            DECL_ANCHOR(match_values);
 
            for (size_t index = 0; index < cast->elements.size; index++) {
                const pm_node_t *element = cast->elements.nodes[index];
                RUBY_ASSERT(PM_NODE_TYPE_P(element, PM_ASSOC_NODE));
 
                const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) element;
                const pm_node_t *key = assoc->key;
                RUBY_ASSERT(PM_NODE_TYPE_P(key, PM_SYMBOL_NODE));
 
                VALUE symbol = ID2SYM(parse_string_symbol(scope_node, (const pm_symbol_node_t *) key));
                PUSH_INSN(ret, location, dup);
                PUSH_INSN1(ret, location, putobject, symbol);
                PUSH_SEND(ret, location, rb_intern("key?"), INT2FIX(1));
 
                if (in_single_pattern) {
                    LABEL *match_succeeded_label = NEW_LABEL(location.line);
 
                    PUSH_INSN(ret, location, dup);
                    PUSH_INSNL(ret, location, branchif, match_succeeded_label);
 
                    {
                        VALUE operand = rb_str_freeze(rb_sprintf("key not found: %+"PRIsVALUE, symbol));
                        RB_OBJ_SET_SHAREABLE(operand);
                        PUSH_INSN1(ret, location, putobject, operand);
                    }
 
                    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 2));
                    PUSH_INSN1(ret, location, putobject, Qtrue);
                    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 3));
                    PUSH_INSN1(ret, location, topn, INT2FIX(3));
                    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_MATCHEE + 4));
                    PUSH_INSN1(ret, location, putobject, symbol);
                    PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_KEY + 5));
 
                    PUSH_INSN1(ret, location, adjuststack, INT2FIX(4));
                    PUSH_LABEL(ret, match_succeeded_label);
                }
 
                PUSH_INSNL(ret, location, branchunless, match_failed_label);
                PUSH_INSN(match_values, location, dup);
                PUSH_INSN1(match_values, location, putobject, symbol);
                PUSH_SEND(match_values, location, has_rest ? rb_intern("delete") : idAREF, INT2FIX(1));
 
                const pm_node_t *value = assoc->value;
                if (PM_NODE_TYPE_P(value, PM_IMPLICIT_NODE)) {
                    value = ((const pm_implicit_node_t *) value)->value;
                }
 
                CHECK(pm_compile_pattern_match(iseq, scope_node, value, match_values, match_failed_label, in_single_pattern, false, base_index + 1));
            }
 
            PUSH_SEQ(ret, match_values);
        }
        else {
            PUSH_INSN(ret, location, dup);
            PUSH_SEND(ret, location, idEmptyP, INT2FIX(0));
            if (in_single_pattern) {
                CHECK(pm_compile_pattern_generic_error(iseq, scope_node, node, ret, rb_fstring_lit("%p is not empty"), base_index + 1));
            }
            PUSH_INSNL(ret, location, branchunless, match_failed_label);
        }
 
        if (has_rest) {
            switch (PM_NODE_TYPE(cast->rest)) {
              case PM_NO_KEYWORDS_PARAMETER_NODE: {
                PUSH_INSN(ret, location, dup);
                PUSH_SEND(ret, location, idEmptyP, INT2FIX(0));
                if (in_single_pattern) {
                    pm_compile_pattern_generic_error(iseq, scope_node, node, ret, rb_fstring_lit("rest of %p is not empty"), base_index + 1);
                }
                PUSH_INSNL(ret, location, branchunless, match_failed_label);
                break;
              }
              case PM_ASSOC_SPLAT_NODE: {
                const pm_assoc_splat_node_t *splat = (const pm_assoc_splat_node_t *) cast->rest;
                PUSH_INSN(ret, location, dup);
                pm_compile_pattern_match(iseq, scope_node, splat->value, ret, match_failed_label, in_single_pattern, false, base_index + 1);
                break;
              }
              default:
                rb_bug("unreachable");
                break;
            }
        }
 
        PUSH_INSN(ret, location, pop);
        PUSH_INSNL(ret, location, jump, matched_label);
        PUSH_INSN(ret, location, putnil);
 
        PUSH_LABEL(ret, type_error_label);
        PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
        PUSH_INSN1(ret, location, putobject, rb_eTypeError);
 
        {
            VALUE operand = rb_fstring_lit("deconstruct_keys must return Hash");
            PUSH_INSN1(ret, location, putobject, operand);
        }
 
        PUSH_SEND(ret, location, id_core_raise, INT2FIX(2));
        PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, match_failed_label);
        PUSH_INSN(ret, location, pop);
        PUSH_INSNL(ret, location, jump, unmatched_label);
        break;
      }
      case PM_CAPTURE_PATTERN_NODE: {
        // Capture patterns allow you to pattern match against an element in a
        // pattern and also capture the value into a local variable. This looks
        // like:
        //
        //     [1] => [Integer => foo]
        //
        // In this case the `Integer => foo` will be represented by a
        // CapturePatternNode, which has both a value (the pattern to match
        // against) and a target (the place to write the variable into).
        const pm_capture_pattern_node_t *cast = (const pm_capture_pattern_node_t *) node;
 
        LABEL *match_failed_label = NEW_LABEL(location.line);
 
        PUSH_INSN(ret, location, dup);
        CHECK(pm_compile_pattern_match(iseq, scope_node, cast->value, ret, match_failed_label, in_single_pattern, use_deconstructed_cache, base_index + 1));
        CHECK(pm_compile_pattern(iseq, scope_node, (const pm_node_t *) cast->target, ret, matched_label, match_failed_label, in_single_pattern, false, base_index));
        PUSH_INSN(ret, location, putnil);
 
        PUSH_LABEL(ret, match_failed_label);
        PUSH_INSN(ret, location, pop);
        PUSH_INSNL(ret, location, jump, unmatched_label);
 
        break;
      }
      case PM_LOCAL_VARIABLE_TARGET_NODE: {
        // Local variables can be targeted by placing identifiers in the place
        // of a pattern. For example, foo in bar. This results in the value
        // being matched being written to that local variable.
        const pm_local_variable_target_node_t *cast = (const pm_local_variable_target_node_t *) node;
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
 
        PUSH_SETLOCAL(ret, location, index.index, index.level);
        PUSH_INSNL(ret, location, jump, matched_label);
        break;
      }
      case PM_ALTERNATION_PATTERN_NODE: {
        // Alternation patterns allow you to specify multiple patterns in a
        // single expression using the | operator.
        const pm_alternation_pattern_node_t *cast = (const pm_alternation_pattern_node_t *) node;
 
        LABEL *matched_left_label = NEW_LABEL(location.line);
        LABEL *unmatched_left_label = NEW_LABEL(location.line);
 
        // First, we're going to attempt to match against the left pattern. If
        // that pattern matches, then we'll skip matching the right pattern.
        PUSH_INSN(ret, location, dup);
        CHECK(pm_compile_pattern(iseq, scope_node, cast->left, ret, matched_left_label, unmatched_left_label, in_single_pattern, use_deconstructed_cache, base_index + 1));
 
        // If we get here, then we matched on the left pattern. In this case we
        // should pop out the duplicate value that we preemptively added to
        // match against the right pattern and then jump to the match label.
        PUSH_LABEL(ret, matched_left_label);
        PUSH_INSN(ret, location, pop);
        PUSH_INSNL(ret, location, jump, matched_label);
        PUSH_INSN(ret, location, putnil);
 
        // If we get here, then we didn't match on the left pattern. In this
        // case we attempt to match against the right pattern.
        PUSH_LABEL(ret, unmatched_left_label);
        CHECK(pm_compile_pattern(iseq, scope_node, cast->right, ret, matched_label, unmatched_label, in_single_pattern, use_deconstructed_cache, base_index));
        break;
      }
      case PM_PARENTHESES_NODE:
        // Parentheses are allowed to wrap expressions in pattern matching and
        // they do nothing since they can only wrap individual expressions and
        // not groups. In this case we'll recurse back into this same function
        // with the body of the parentheses.
        return pm_compile_pattern(iseq, scope_node, ((const pm_parentheses_node_t *) node)->body, ret, matched_label, unmatched_label, in_single_pattern, use_deconstructed_cache, base_index);
      case PM_PINNED_EXPRESSION_NODE:
        // Pinned expressions are a way to match against the value of an
        // expression that should be evaluated at runtime. This looks like:
        // foo in ^(bar). To compile these, we compile the expression as if it
        // were a literal value by falling through to the literal case.
        node = ((const pm_pinned_expression_node_t *) node)->expression;
        /* fallthrough */
      case PM_ARRAY_NODE:
      case PM_CLASS_VARIABLE_READ_NODE:
      case PM_CONSTANT_PATH_NODE:
      case PM_CONSTANT_READ_NODE:
      case PM_FALSE_NODE:
      case PM_FLOAT_NODE:
      case PM_GLOBAL_VARIABLE_READ_NODE:
      case PM_IMAGINARY_NODE:
      case PM_INSTANCE_VARIABLE_READ_NODE:
      case PM_IT_LOCAL_VARIABLE_READ_NODE:
      case PM_INTEGER_NODE:
      case PM_INTERPOLATED_REGULAR_EXPRESSION_NODE:
      case PM_INTERPOLATED_STRING_NODE:
      case PM_INTERPOLATED_SYMBOL_NODE:
      case PM_INTERPOLATED_X_STRING_NODE:
      case PM_LAMBDA_NODE:
      case PM_LOCAL_VARIABLE_READ_NODE:
      case PM_NIL_NODE:
      case PM_SOURCE_ENCODING_NODE:
      case PM_SOURCE_FILE_NODE:
      case PM_SOURCE_LINE_NODE:
      case PM_RANGE_NODE:
      case PM_RATIONAL_NODE:
      case PM_REGULAR_EXPRESSION_NODE:
      case PM_SELF_NODE:
      case PM_STRING_NODE:
      case PM_SYMBOL_NODE:
      case PM_TRUE_NODE:
      case PM_X_STRING_NODE: {
        // These nodes are all simple patterns, which means we'll use the
        // checkmatch instruction to match against them, which is effectively a
        // VM-level === operator.
        PM_COMPILE_NOT_POPPED(node);
        if (in_single_pattern) {
            PUSH_INSN1(ret, location, dupn, INT2FIX(2));
        }
 
        PUSH_INSN1(ret, location, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_CASE));
 
        if (in_single_pattern) {
            pm_compile_pattern_eqq_error(iseq, scope_node, node, ret, base_index + 2);
        }
 
        PUSH_INSNL(ret, location, branchif, matched_label);
        PUSH_INSNL(ret, location, jump, unmatched_label);
        break;
      }
      case PM_PINNED_VARIABLE_NODE: {
        // Pinned variables are a way to match against the value of a variable
        // without it looking like you're trying to write to the variable. This
        // looks like: foo in ^@bar. To compile these, we compile the variable
        // that they hold.
        const pm_pinned_variable_node_t *cast = (const pm_pinned_variable_node_t *) node;
        CHECK(pm_compile_pattern(iseq, scope_node, cast->variable, ret, matched_label, unmatched_label, in_single_pattern, true, base_index));
        break;
      }
      case PM_IF_NODE:
      case PM_UNLESS_NODE: {
        // If and unless nodes can show up here as guards on `in` clauses. This
        // looks like:
        //
        //     case foo
        //     in bar if baz?
        //       qux
        //     end
        //
        // Because we know they're in the modifier form and they can't have any
        // variation on this pattern, we compile them differently (more simply)
        // here than we would in the normal compilation path.
        const pm_node_t *predicate;
        const pm_node_t *statement;
 
        if (PM_NODE_TYPE_P(node, PM_IF_NODE)) {
            const pm_if_node_t *cast = (const pm_if_node_t *) node;
            predicate = cast->predicate;
 
            RUBY_ASSERT(cast->statements != NULL && cast->statements->body.size == 1);
            statement = cast->statements->body.nodes[0];
        }
        else {
            const pm_unless_node_t *cast = (const pm_unless_node_t *) node;
            predicate = cast->predicate;
 
            RUBY_ASSERT(cast->statements != NULL && cast->statements->body.size == 1);
            statement = cast->statements->body.nodes[0];
        }
 
        CHECK(pm_compile_pattern_match(iseq, scope_node, statement, ret, unmatched_label, in_single_pattern, use_deconstructed_cache, base_index));
        PM_COMPILE_NOT_POPPED(predicate);
 
        if (in_single_pattern) {
            LABEL *match_succeeded_label = NEW_LABEL(location.line);
 
            PUSH_INSN(ret, location, dup);
            if (PM_NODE_TYPE_P(node, PM_IF_NODE)) {
                PUSH_INSNL(ret, location, branchif, match_succeeded_label);
            }
            else {
                PUSH_INSNL(ret, location, branchunless, match_succeeded_label);
            }
 
            {
                VALUE operand = rb_fstring_lit("guard clause does not return true");
                PUSH_INSN1(ret, location, putobject, operand);
            }
 
            PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING + 1));
            PUSH_INSN1(ret, location, putobject, Qfalse);
            PUSH_INSN1(ret, location, setn, INT2FIX(base_index + PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P + 2));
 
            PUSH_INSN(ret, location, pop);
            PUSH_INSN(ret, location, pop);
 
            PUSH_LABEL(ret, match_succeeded_label);
        }
 
        if (PM_NODE_TYPE_P(node, PM_IF_NODE)) {
            PUSH_INSNL(ret, location, branchunless, unmatched_label);
        }
        else {
            PUSH_INSNL(ret, location, branchif, unmatched_label);
        }
 
        PUSH_INSNL(ret, location, jump, matched_label);
        break;
      }
      default:
        // If we get here, then we have a node type that should not be in this
        // position. This would be a bug in the parser, because a different node
        // type should never have been created in this position in the tree.
        rb_bug("Unexpected node type in pattern matching expression: %s", pm_node_type(PM_NODE_TYPE(node)));
        break;
    }
 
    return COMPILE_OK;
}
 
#undef PM_PATTERN_BASE_INDEX_OFFSET_DECONSTRUCTED_CACHE
#undef PM_PATTERN_BASE_INDEX_OFFSET_ERROR_STRING
#undef PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_P
#undef PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_MATCHEE
#undef PM_PATTERN_BASE_INDEX_OFFSET_KEY_ERROR_KEY
 
// Generate a scope node from the given node.
void
pm_scope_node_init(const pm_node_t *node, pm_scope_node_t *scope, pm_scope_node_t *previous)
{
    if (previous) {
        // Copy inherited fields from the parent scope in one shot, then
        // zero out the fields that are scope-specific.
        *scope = *previous;
        scope->locals = (pm_constant_id_list_t) { 0 };
        scope->parameters = NULL;
        scope->body = NULL;
        scope->local_table_for_iseq_size = 0;
        scope->index_lookup_table = (pm_index_lookup_table_t) PM_INDEX_LOOKUP_TABLE_INIT;
        scope->pre_execution_anchor = NULL;
    }
    else {
        memset(scope, 0, sizeof(pm_scope_node_t));
    }
 
    scope->base.type = PM_SCOPE_NODE;
    scope->base.location.start = node->location.start;
    scope->base.location.length = node->location.length;
    scope->previous = previous;
    scope->ast_node = (pm_node_t *) node;
 
    switch (PM_NODE_TYPE(node)) {
      case PM_BLOCK_NODE: {
        const pm_block_node_t *cast = (const pm_block_node_t *) node;
        scope->body = cast->body;
        scope->locals = cast->locals;
        scope->parameters = cast->parameters;
        break;
      }
      case PM_CLASS_NODE: {
        const pm_class_node_t *cast = (const pm_class_node_t *) node;
        scope->body = cast->body;
        scope->locals = cast->locals;
        break;
      }
      case PM_DEF_NODE: {
        const pm_def_node_t *cast = (const pm_def_node_t *) node;
        scope->parameters = (pm_node_t *) cast->parameters;
        scope->body = cast->body;
        scope->locals = cast->locals;
        break;
      }
      case PM_ENSURE_NODE: {
        const pm_ensure_node_t *cast = (const pm_ensure_node_t *) node;
        scope->body = (pm_node_t *) node;
 
        if (cast->statements != NULL) {
            scope->base.location.start = cast->statements->base.location.start;
            scope->base.location.length = cast->statements->base.location.length;
        }
 
        break;
      }
      case PM_FOR_NODE: {
        const pm_for_node_t *cast = (const pm_for_node_t *) node;
        scope->body = (pm_node_t *) cast->statements;
        break;
      }
      case PM_INTERPOLATED_REGULAR_EXPRESSION_NODE: {
        RUBY_ASSERT(node->flags & PM_REGULAR_EXPRESSION_FLAGS_ONCE);
        scope->body = (pm_node_t *) node;
        break;
      }
      case PM_LAMBDA_NODE: {
        const pm_lambda_node_t *cast = (const pm_lambda_node_t *) node;
        scope->parameters = cast->parameters;
        scope->body = cast->body;
        scope->locals = cast->locals;
        break;
      }
      case PM_MODULE_NODE: {
        const pm_module_node_t *cast = (const pm_module_node_t *) node;
        scope->body = cast->body;
        scope->locals = cast->locals;
        break;
      }
      case PM_POST_EXECUTION_NODE: {
        const pm_post_execution_node_t *cast = (const pm_post_execution_node_t *) node;
        scope->body = (pm_node_t *) cast->statements;
        break;
      }
      case PM_PROGRAM_NODE: {
        const pm_program_node_t *cast = (const pm_program_node_t *) node;
        scope->body = (pm_node_t *) cast->statements;
        scope->locals = cast->locals;
        break;
      }
      case PM_RESCUE_NODE: {
        const pm_rescue_node_t *cast = (const pm_rescue_node_t *) node;
        scope->body = (pm_node_t *) cast->statements;
        break;
      }
      case PM_RESCUE_MODIFIER_NODE: {
        const pm_rescue_modifier_node_t *cast = (const pm_rescue_modifier_node_t *) node;
        scope->body = (pm_node_t *) cast->rescue_expression;
        break;
      }
      case PM_SINGLETON_CLASS_NODE: {
        const pm_singleton_class_node_t *cast = (const pm_singleton_class_node_t *) node;
        scope->body = cast->body;
        scope->locals = cast->locals;
        break;
      }
      case PM_STATEMENTS_NODE: {
        const pm_statements_node_t *cast = (const pm_statements_node_t *) node;
        scope->body = (pm_node_t *) cast;
        break;
      }
      default:
        rb_bug("unreachable");
        break;
    }
}
 
void
pm_scope_node_destroy(pm_scope_node_t *scope_node)
{
    if (scope_node->index_lookup_table.owned) {
        xfree(scope_node->index_lookup_table.values);
    }
}
 
static void
pm_compile_retry_end_label(rb_iseq_t *iseq, LINK_ANCHOR *const ret, LABEL *retry_end_l)
{
    INSN *iobj;
    LINK_ELEMENT *last_elem = LAST_ELEMENT(ret);
    iobj = IS_INSN(last_elem) ? (INSN*) last_elem : (INSN*) get_prev_insn((INSN*) last_elem);
    while (!IS_INSN_ID(iobj, send) && !IS_INSN_ID(iobj, invokesuper) && !IS_INSN_ID(iobj, sendforward) && !IS_INSN_ID(iobj, invokesuperforward)) {
        iobj = (INSN*) get_prev_insn(iobj);
    }
    ELEM_INSERT_NEXT(&iobj->link, (LINK_ELEMENT*) retry_end_l);
 
    // LINK_ANCHOR has a pointer to the last element, but
    // ELEM_INSERT_NEXT does not update it even if we add an insn to the
    // last of LINK_ANCHOR. So this updates it manually.
    if (&iobj->link == LAST_ELEMENT(ret)) {
        ret->last = (LINK_ELEMENT*) retry_end_l;
    }
}
 
static const char *
pm_iseq_builtin_function_name(const pm_scope_node_t *scope_node, const pm_node_t *receiver, ID method_id)
{
    const char *name = rb_id2name(method_id);
    static const char prefix[] = "__builtin_";
    const size_t prefix_len = sizeof(prefix) - 1;
 
    if (receiver == NULL) {
        if (UNLIKELY(strncmp(prefix, name, prefix_len) == 0)) {
            // __builtin_foo
            return &name[prefix_len];
        }
    }
    else if (PM_NODE_TYPE_P(receiver, PM_CALL_NODE)) {
        if (PM_NODE_FLAG_P(receiver, PM_CALL_NODE_FLAGS_VARIABLE_CALL)) {
            const pm_call_node_t *cast = (const pm_call_node_t *) receiver;
            if (pm_constant_id_lookup(scope_node, cast->name) == rb_intern_const("__builtin")) {
                // __builtin.foo
                return name;
            }
        }
    }
    else if (PM_NODE_TYPE_P(receiver, PM_CONSTANT_READ_NODE)) {
        const pm_constant_read_node_t *cast = (const pm_constant_read_node_t *) receiver;
        if (pm_constant_id_lookup(scope_node, cast->name) == rb_intern_const("Primitive")) {
            // Primitive.foo
            return name;
        }
    }
 
    return NULL;
}
 
// Compile Primitive.attr! :leaf, ...
static int
pm_compile_builtin_attr(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_arguments_node_t *arguments, const pm_node_location_t *node_location)
{
    if (arguments == NULL) {
        COMPILE_ERROR(iseq, node_location->line, "attr!: no argument");
        return COMPILE_NG;
    }
 
    const pm_node_t *argument;
    PM_NODE_LIST_FOREACH(&arguments->arguments, index, argument) {
        if (!PM_NODE_TYPE_P(argument, PM_SYMBOL_NODE)) {
            COMPILE_ERROR(iseq, node_location->line, "non symbol argument to attr!: %s", pm_node_type(PM_NODE_TYPE(argument)));
            return COMPILE_NG;
        }
 
        VALUE symbol = pm_static_literal_value(iseq, argument, scope_node);
        if (compile_builtin_attr_symbol(iseq, symbol) != COMPILE_OK) {
            COMPILE_ERROR(iseq, node_location->line, "unknown argument to attr!: %" PRIsVALUE, symbol);
            return COMPILE_NG;
        }
    }
 
    return COMPILE_OK;
}
 
static int
pm_compile_builtin_arg(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const pm_scope_node_t *scope_node, const pm_arguments_node_t *arguments, const pm_node_location_t *node_location, int popped)
{
    if (arguments == NULL) {
        COMPILE_ERROR(iseq, node_location->line, "arg!: no argument");
        return COMPILE_NG;
    }
 
    if (arguments->arguments.size != 1) {
        COMPILE_ERROR(iseq, node_location->line, "arg!: too many argument");
        return COMPILE_NG;
    }
 
    const pm_node_t *argument = arguments->arguments.nodes[0];
    if (!PM_NODE_TYPE_P(argument, PM_SYMBOL_NODE)) {
        COMPILE_ERROR(iseq, node_location->line, "non symbol argument to arg!: %s", pm_node_type(PM_NODE_TYPE(argument)));
        return COMPILE_NG;
    }
 
    if (!popped) {
        ID name = parse_string_symbol(scope_node, ((const pm_symbol_node_t *) argument));
        int index = ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->local_table_size - get_local_var_idx(iseq, name);
 
        debugs("id: %s idx: %d\n", rb_id2name(name), index);
        PUSH_GETLOCAL(ret, *node_location, index, get_lvar_level(iseq));
    }
 
    return COMPILE_OK;
}
 
static int
pm_compile_builtin_mandatory_only_method(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_call_node_t *call_node, const pm_node_location_t *node_location)
{
    const pm_node_t *ast_node = scope_node->ast_node;
    if (!PM_NODE_TYPE_P(ast_node, PM_DEF_NODE)) {
        rb_bug("mandatory_only?: not in method definition");
        return COMPILE_NG;
    }
 
    const pm_def_node_t *def_node = (const pm_def_node_t *) ast_node;
    const pm_parameters_node_t *parameters_node = def_node->parameters;
    if (parameters_node == NULL) {
        rb_bug("mandatory_only?: in method definition with no parameters");
        return COMPILE_NG;
    }
 
    const pm_node_t *body_node = def_node->body;
    if (body_node == NULL || !PM_NODE_TYPE_P(body_node, PM_STATEMENTS_NODE) || (((const pm_statements_node_t *) body_node)->body.size != 1) || !PM_NODE_TYPE_P(((const pm_statements_node_t *) body_node)->body.nodes[0], PM_IF_NODE)) {
        rb_bug("mandatory_only?: not in method definition with plain statements");
        return COMPILE_NG;
    }
 
    const pm_if_node_t *if_node = (const pm_if_node_t *) ((const pm_statements_node_t *) body_node)->body.nodes[0];
    if (if_node->predicate != ((const pm_node_t *) call_node)) {
        rb_bug("mandatory_only?: can't find mandatory node");
        return COMPILE_NG;
    }
 
    pm_parameters_node_t parameters = {
        .base = parameters_node->base,
        .requireds = parameters_node->requireds
    };
 
    const pm_def_node_t def = {
        .base = def_node->base,
        .name = def_node->name,
        .receiver = def_node->receiver,
        .parameters = &parameters,
        .body = (pm_node_t *) if_node->statements,
        .locals = {
            .ids = def_node->locals.ids,
            .size = parameters_node->requireds.size,
            .capacity = def_node->locals.capacity
        }
    };
 
    pm_scope_node_t next_scope_node;
    pm_scope_node_init(&def.base, &next_scope_node, scope_node);
 
    const rb_iseq_t *mandatory_only_iseq = pm_iseq_build(
        &next_scope_node,
        rb_iseq_base_label(iseq),
        rb_iseq_path(iseq),
        rb_iseq_realpath(iseq),
        node_location->line,
        NULL,
        0,
        ISEQ_TYPE_METHOD,
        ISEQ_COMPILE_DATA(iseq)->option
    );
    RB_OBJ_WRITE(iseq, &ISEQ_BODY(iseq)->mandatory_only_iseq, (VALUE)mandatory_only_iseq);
 
    pm_scope_node_destroy(&next_scope_node);
    return COMPILE_OK;
}
 
static int
pm_compile_builtin_function_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node, const pm_call_node_t *call_node, const pm_node_location_t *node_location, int popped, const rb_iseq_t *parent_block, const char *builtin_func)
{
    const pm_arguments_node_t *arguments = call_node->arguments;
 
    if (parent_block != NULL) {
        COMPILE_ERROR(iseq, node_location->line, "should not call builtins here.");
        return COMPILE_NG;
    }
 
#define BUILTIN_INLINE_PREFIX "_bi"
    char inline_func[sizeof(BUILTIN_INLINE_PREFIX) + DECIMAL_SIZE_OF(int)];
    bool cconst = false;
retry:;
    const struct rb_builtin_function *bf = iseq_builtin_function_lookup(iseq, builtin_func);
 
    if (bf == NULL) {
        if (strcmp("cstmt!", builtin_func) == 0 || strcmp("cexpr!", builtin_func) == 0) {
            // ok
        }
        else if (strcmp("cconst!", builtin_func) == 0) {
            cconst = true;
        }
        else if (strcmp("cinit!", builtin_func) == 0) {
            // ignore
            return COMPILE_OK;
        }
        else if (strcmp("attr!", builtin_func) == 0) {
            return pm_compile_builtin_attr(iseq, scope_node, arguments, node_location);
        }
        else if (strcmp("arg!", builtin_func) == 0) {
            return pm_compile_builtin_arg(iseq, ret, scope_node, arguments, node_location, popped);
        }
        else if (strcmp("mandatory_only?", builtin_func) == 0) {
            if (popped) {
                rb_bug("mandatory_only? should be in if condition");
            }
            else if (!LIST_INSN_SIZE_ZERO(ret)) {
                rb_bug("mandatory_only? should be put on top");
            }
 
            PUSH_INSN1(ret, *node_location, putobject, Qfalse);
            return pm_compile_builtin_mandatory_only_method(iseq, scope_node, call_node, node_location);
        }
        else if (1) {
            rb_bug("can't find builtin function:%s", builtin_func);
        }
        else {
            COMPILE_ERROR(iseq, node_location->line, "can't find builtin function:%s", builtin_func);
            return COMPILE_NG;
        }
 
        int inline_index = node_location->line;
        snprintf(inline_func, sizeof(inline_func), BUILTIN_INLINE_PREFIX "%d", inline_index);
        builtin_func = inline_func;
        arguments = NULL;
        goto retry;
    }
 
    if (cconst) {
        typedef VALUE(*builtin_func0)(void *, VALUE);
        VALUE const_val = (*(builtin_func0)(uintptr_t)bf->func_ptr)(NULL, Qnil);
        PUSH_INSN1(ret, *node_location, putobject, const_val);
        return COMPILE_OK;
    }
 
    // fprintf(stderr, "func_name:%s -> %p\n", builtin_func, bf->func_ptr);
 
    DECL_ANCHOR(args_seq);
 
    int flags = 0;
    struct rb_callinfo_kwarg *keywords = NULL;
    int argc = pm_setup_args(arguments, call_node->block, &flags, &keywords, iseq, args_seq, scope_node, node_location);
 
    if (argc != bf->argc) {
        COMPILE_ERROR(iseq, node_location->line, "argc is not match for builtin function:%s (expect %d but %d)", builtin_func, bf->argc, argc);
        return COMPILE_NG;
    }
 
    unsigned int start_index;
    if (delegate_call_p(iseq, argc, args_seq, &start_index)) {
        PUSH_INSN2(ret, *node_location, opt_invokebuiltin_delegate, bf, INT2FIX(start_index));
    }
    else {
        PUSH_SEQ(ret, args_seq);
        PUSH_INSN1(ret, *node_location, invokebuiltin, bf);
    }
 
    if (popped) PUSH_INSN(ret, *node_location, pop);
    return COMPILE_OK;
}
 
static void
pm_compile_call(rb_iseq_t *iseq, const pm_call_node_t *call_node, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node, ID method_id, LABEL *start)
{
    const pm_location_t *message_loc = &call_node->message_loc;
    if (message_loc->length == 0) message_loc = &call_node->base.location;
 
    const pm_node_location_t location = PM_LOCATION_START_LOCATION(message_loc, call_node->base.node_id);
 
    LABEL *else_label = NEW_LABEL(location.line);
    LABEL *end_label = NEW_LABEL(location.line);
    LABEL *retry_end_l = NEW_LABEL(location.line);
 
    VALUE branches = Qfalse;
    rb_code_location_t code_location = { 0 };
    int node_id = location.node_id;
 
    if (PM_NODE_FLAG_P(call_node, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION)) {
        if (PM_BRANCH_COVERAGE_P(iseq)) {
            uint32_t end_cursor = 0;
            bool end_found = false;
 
            if (call_node->closing_loc.length > 0) {
                uint32_t cursor = call_node->closing_loc.start + call_node->closing_loc.length;
                end_cursor = cursor;
                end_found = true;
            }
 
            if (call_node->arguments != NULL) {
                uint32_t cursor = call_node->arguments->base.location.start + call_node->arguments->base.location.length;
                if (!end_found || cursor > end_cursor) {
                    end_cursor = cursor;
                    end_found = true;
                }
            }
 
            if (call_node->message_loc.length > 0) {
                uint32_t cursor = call_node->message_loc.start + call_node->message_loc.length;
                if (!end_found || cursor > end_cursor) {
                    end_cursor = cursor;
                    end_found = true;
                }
            }
 
            if (!end_found) {
                end_cursor = call_node->closing_loc.start + call_node->closing_loc.length;
            }
 
            const pm_line_column_t start_location = PM_NODE_START_LINE_COLUMN(call_node);
            const pm_line_column_t end_location = pm_line_offset_list_line_column_cached(scope_node->line_offsets, end_cursor, scope_node->start_line, &scope_node->last_line);
 
            code_location = (rb_code_location_t) {
                .beg_pos = { .lineno = start_location.line, .column = start_location.column },
                .end_pos = { .lineno = end_location.line, .column = end_location.column }
            };
 
            branches = decl_branch_base(iseq, (int) call_node->base.node_id, &code_location, "&.");
        }
 
        PUSH_INSN(ret, location, dup);
        PUSH_INSNL(ret, location, branchnil, else_label);
 
        add_trace_branch_coverage(iseq, ret, &code_location, node_id, 0, "then", branches);
    }
 
    LINK_ELEMENT *opt_new_prelude = LAST_ELEMENT(ret);
 
    int flags = 0;
    struct rb_callinfo_kwarg *kw_arg = NULL;
 
    int orig_argc = pm_setup_args(call_node->arguments, call_node->block, &flags, &kw_arg, iseq, ret, scope_node, &location);
    const rb_iseq_t *previous_block = ISEQ_COMPILE_DATA(iseq)->current_block;
    const rb_iseq_t *block_iseq = NULL;
 
    if (call_node->block != NULL && PM_NODE_TYPE_P(call_node->block, PM_BLOCK_NODE)) {
        // Scope associated with the block
        pm_scope_node_t next_scope_node;
        pm_scope_node_init(call_node->block, &next_scope_node, scope_node);
 
        block_iseq = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, pm_node_line_number_cached(call_node->block, scope_node));
        pm_scope_node_destroy(&next_scope_node);
        ISEQ_COMPILE_DATA(iseq)->current_block = block_iseq;
    }
    else {
        if (PM_NODE_FLAG_P(call_node, PM_CALL_NODE_FLAGS_VARIABLE_CALL)) {
            flags |= VM_CALL_VCALL;
        }
 
        if (!flags) {
            flags |= VM_CALL_ARGS_SIMPLE;
        }
    }
 
    if (PM_NODE_FLAG_P(call_node, PM_CALL_NODE_FLAGS_IGNORE_VISIBILITY)) {
        flags |= VM_CALL_FCALL;
    }
 
    if (!popped && PM_NODE_FLAG_P(call_node, PM_CALL_NODE_FLAGS_ATTRIBUTE_WRITE)) {
        if (flags & VM_CALL_ARGS_BLOCKARG) {
            PUSH_INSN1(ret, location, topn, INT2FIX(1));
            if (flags & VM_CALL_ARGS_SPLAT) {
                PUSH_INSN1(ret, location, putobject, INT2FIX(-1));
                PUSH_SEND_WITH_FLAG(ret, location, idAREF, INT2FIX(1), INT2FIX(0));
            }
            PUSH_INSN1(ret, location, setn, INT2FIX(orig_argc + 3));
            PUSH_INSN(ret, location, pop);
        }
        else if (flags & VM_CALL_ARGS_SPLAT) {
            PUSH_INSN(ret, location, dup);
            PUSH_INSN1(ret, location, putobject, INT2FIX(-1));
            PUSH_SEND_WITH_FLAG(ret, location, idAREF, INT2FIX(1), INT2FIX(0));
            PUSH_INSN1(ret, location, setn, INT2FIX(orig_argc + 2));
            PUSH_INSN(ret, location, pop);
        }
        else {
            PUSH_INSN1(ret, location, setn, INT2FIX(orig_argc + 1));
        }
    }
 
    if ((flags & VM_CALL_KW_SPLAT) && (flags & VM_CALL_ARGS_BLOCKARG) && !(flags & VM_CALL_KW_SPLAT_MUT)) {
        PUSH_INSN(ret, location, splatkw);
    }
 
    LABEL *not_basic_new = NEW_LABEL(location.line);
    LABEL *not_basic_new_finish = NEW_LABEL(location.line);
 
    bool inline_new = ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction &&
        method_id == rb_intern("new") &&
        call_node->block == NULL &&
        (flags & VM_CALL_ARGS_BLOCKARG) == 0;
 
    if (inline_new) {
        if (LAST_ELEMENT(ret) == opt_new_prelude) {
            PUSH_INSN(ret, location, putnil);
            PUSH_INSN(ret, location, swap);
        }
        else {
            ELEM_INSERT_NEXT(opt_new_prelude, &new_insn_body(iseq, location.line, location.node_id, BIN(swap), 0)->link);
            ELEM_INSERT_NEXT(opt_new_prelude, &new_insn_body(iseq, location.line, location.node_id, BIN(putnil), 0)->link);
        }
 
        rb_callinfo_kwarg_retain(kw_arg);
 
        // Jump unless the receiver uses the "basic" implementation of "new"
        VALUE ci;
        if (flags & VM_CALL_FORWARDING) {
            ci = (VALUE)new_callinfo(iseq, method_id, orig_argc + 1, flags, kw_arg, 0);
        }
        else {
            ci = (VALUE)new_callinfo(iseq, method_id, orig_argc, flags, kw_arg, 0);
        }
 
        PUSH_INSN2(ret, location, opt_new, ci, not_basic_new);
        LABEL_REF(not_basic_new);
        // optimized path
        PUSH_SEND_R(ret, location, rb_intern("initialize"), INT2FIX(orig_argc), block_iseq, INT2FIX(flags | VM_CALL_FCALL), kw_arg);
        PUSH_INSNL(ret, location, jump, not_basic_new_finish);
 
        PUSH_LABEL(ret, not_basic_new);
        // Fall back to normal send
        PUSH_SEND_R(ret, location, method_id, INT2FIX(orig_argc), block_iseq, INT2FIX(flags), kw_arg);
        PUSH_INSN(ret, location, swap);
 
        PUSH_LABEL(ret, not_basic_new_finish);
        PUSH_INSN(ret, location, pop);
 
        rb_callinfo_kwarg_release(kw_arg);
    }
    else {
        PUSH_SEND_R(ret, location, method_id, INT2FIX(orig_argc), block_iseq, INT2FIX(flags), kw_arg);
    }
 
    if (block_iseq && ISEQ_BODY(block_iseq)->catch_table) {
        pm_compile_retry_end_label(iseq, ret, retry_end_l);
        PUSH_CATCH_ENTRY(CATCH_TYPE_BREAK, start, retry_end_l, block_iseq, retry_end_l);
    }
 
    if (PM_NODE_FLAG_P(call_node, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION)) {
        PUSH_INSNL(ret, location, jump, end_label);
        PUSH_LABEL(ret, else_label);
        add_trace_branch_coverage(iseq, ret, &code_location, node_id, 1, "else", branches);
        PUSH_LABEL(ret, end_label);
    }
 
    if (PM_NODE_FLAG_P(call_node, PM_CALL_NODE_FLAGS_ATTRIBUTE_WRITE) && !popped) {
        PUSH_INSN(ret, location, pop);
    }
 
    if (popped) PUSH_INSN(ret, location, pop);
    ISEQ_COMPILE_DATA(iseq)->current_block = previous_block;
}
 
static inline VALUE
pm_compile_back_reference_ref(const pm_scope_node_t *scope_node, const pm_back_reference_read_node_t *node)
{
    const char *type = (const char *) (pm_parser_start(scope_node->parser) + node->base.location.start + 1);
 
    // Since a back reference is `$<char>`, Ruby represents the ID as an
    // rb_intern on the value after the `$`.
    return INT2FIX(rb_intern2(type, 1)) << 1 | 1;
}
 
static inline VALUE
pm_compile_numbered_reference_ref(const pm_numbered_reference_read_node_t *node)
{
    return INT2FIX(node->number << 1);
}
 
static void
pm_compile_defined_expr0(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node, bool in_condition, LABEL **lfinish, bool explicit_receiver)
{
#define PUSH_VAL(type) (in_condition ? Qtrue : rb_iseq_defined_string(type))
 
    // in_condition is the same as compile.c's needstr
    enum defined_type dtype = DEFINED_NOT_DEFINED;
    const pm_node_location_t location = *node_location;
 
    switch (PM_NODE_TYPE(node)) {
/* DEFINED_NIL ****************************************************************/
      case PM_NIL_NODE:
        // defined?(nil)
        //          ^^^
        dtype = DEFINED_NIL;
        break;
/* DEFINED_IVAR ***************************************************************/
      case PM_INSTANCE_VARIABLE_READ_NODE: {
        // defined?(@a)
        //          ^^
        const pm_instance_variable_read_node_t *cast = (const pm_instance_variable_read_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        PUSH_INSN3(ret, location, definedivar, ID2SYM(name), get_ivar_ic_value(iseq, name), PUSH_VAL(DEFINED_IVAR));
 
        return;
      }
/* DEFINED_LVAR ***************************************************************/
      case PM_LOCAL_VARIABLE_READ_NODE:
        // a = 1; defined?(a)
        //                 ^
      case PM_IT_LOCAL_VARIABLE_READ_NODE:
        // 1.then { defined?(it) }
        //                   ^^
        dtype = DEFINED_LVAR;
        break;
/* DEFINED_GVAR ***************************************************************/
      case PM_GLOBAL_VARIABLE_READ_NODE: {
        // defined?($a)
        //          ^^
        const pm_global_variable_read_node_t *cast = (const pm_global_variable_read_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_GVAR), ID2SYM(name), PUSH_VAL(DEFINED_GVAR));
 
        return;
      }
/* DEFINED_CVAR ***************************************************************/
      case PM_CLASS_VARIABLE_READ_NODE: {
        // defined?(@@a)
        //          ^^^
        const pm_class_variable_read_node_t *cast = (const pm_class_variable_read_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_CVAR), ID2SYM(name), PUSH_VAL(DEFINED_CVAR));
 
        return;
      }
/* DEFINED_CONST **************************************************************/
      case PM_CONSTANT_READ_NODE: {
        // defined?(A)
        //          ^
        const pm_constant_read_node_t *cast = (const pm_constant_read_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_CONST), ID2SYM(name), PUSH_VAL(DEFINED_CONST));
 
        return;
      }
/* DEFINED_YIELD **************************************************************/
      case PM_YIELD_NODE:
        // defined?(yield)
        //          ^^^^^
        iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_YIELD), 0, PUSH_VAL(DEFINED_YIELD));
 
        return;
/* DEFINED_ZSUPER *************************************************************/
      case PM_SUPER_NODE: {
        // defined?(super 1, 2)
        //          ^^^^^^^^^^
        const pm_super_node_t *cast = (const pm_super_node_t *) node;
 
        if (cast->block != NULL && !PM_NODE_TYPE_P(cast->block, PM_BLOCK_ARGUMENT_NODE)) {
            dtype = DEFINED_EXPR;
            break;
        }
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_ZSUPER), 0, PUSH_VAL(DEFINED_ZSUPER));
        return;
      }
      case PM_FORWARDING_SUPER_NODE: {
        // defined?(super)
        //          ^^^^^
        const pm_forwarding_super_node_t *cast = (const pm_forwarding_super_node_t *) node;
 
        if (cast->block != NULL) {
            dtype = DEFINED_EXPR;
            break;
        }
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_ZSUPER), 0, PUSH_VAL(DEFINED_ZSUPER));
        return;
      }
/* DEFINED_SELF ***************************************************************/
      case PM_SELF_NODE:
        // defined?(self)
        //          ^^^^
        dtype = DEFINED_SELF;
        break;
/* DEFINED_TRUE ***************************************************************/
      case PM_TRUE_NODE:
        // defined?(true)
        //          ^^^^
        dtype = DEFINED_TRUE;
        break;
/* DEFINED_FALSE **************************************************************/
      case PM_FALSE_NODE:
        // defined?(false)
        //          ^^^^^
        dtype = DEFINED_FALSE;
        break;
/* DEFINED_ASGN ***************************************************************/
      case PM_CALL_AND_WRITE_NODE:
        // defined?(a.a &&= 1)
        //          ^^^^^^^^^
      case PM_CALL_OPERATOR_WRITE_NODE:
        // defined?(a.a += 1)
        //          ^^^^^^^^
      case PM_CALL_OR_WRITE_NODE:
        // defined?(a.a ||= 1)
        //          ^^^^^^^^^
      case PM_CLASS_VARIABLE_AND_WRITE_NODE:
        // defined?(@@a &&= 1)
        //          ^^^^^^^^^
      case PM_CLASS_VARIABLE_OPERATOR_WRITE_NODE:
        // defined?(@@a += 1)
        //          ^^^^^^^^
      case PM_CLASS_VARIABLE_OR_WRITE_NODE:
        // defined?(@@a ||= 1)
        //          ^^^^^^^^^
      case PM_CLASS_VARIABLE_WRITE_NODE:
        // defined?(@@a = 1)
        //          ^^^^^^^
      case PM_CONSTANT_AND_WRITE_NODE:
        // defined?(A &&= 1)
        //          ^^^^^^^
      case PM_CONSTANT_OPERATOR_WRITE_NODE:
        // defined?(A += 1)
        //          ^^^^^^
      case PM_CONSTANT_OR_WRITE_NODE:
        // defined?(A ||= 1)
        //          ^^^^^^^
      case PM_CONSTANT_PATH_AND_WRITE_NODE:
        // defined?(A::A &&= 1)
        //          ^^^^^^^^^^
      case PM_CONSTANT_PATH_OPERATOR_WRITE_NODE:
        // defined?(A::A += 1)
        //          ^^^^^^^^^
      case PM_CONSTANT_PATH_OR_WRITE_NODE:
        // defined?(A::A ||= 1)
        //          ^^^^^^^^^^
      case PM_CONSTANT_PATH_WRITE_NODE:
        // defined?(A::A = 1)
        //          ^^^^^^^^
      case PM_CONSTANT_WRITE_NODE:
        // defined?(A = 1)
        //          ^^^^^
      case PM_GLOBAL_VARIABLE_AND_WRITE_NODE:
        // defined?($a &&= 1)
        //          ^^^^^^^^
      case PM_GLOBAL_VARIABLE_OPERATOR_WRITE_NODE:
        // defined?($a += 1)
        //          ^^^^^^^
      case PM_GLOBAL_VARIABLE_OR_WRITE_NODE:
        // defined?($a ||= 1)
        //          ^^^^^^^^
      case PM_GLOBAL_VARIABLE_WRITE_NODE:
        // defined?($a = 1)
        //          ^^^^^^
      case PM_INDEX_AND_WRITE_NODE:
        // defined?(a[1] &&= 1)
        //          ^^^^^^^^^^
      case PM_INDEX_OPERATOR_WRITE_NODE:
        // defined?(a[1] += 1)
        //          ^^^^^^^^^
      case PM_INDEX_OR_WRITE_NODE:
        // defined?(a[1] ||= 1)
        //          ^^^^^^^^^^
      case PM_INSTANCE_VARIABLE_AND_WRITE_NODE:
        // defined?(@a &&= 1)
        //          ^^^^^^^^
      case PM_INSTANCE_VARIABLE_OPERATOR_WRITE_NODE:
        // defined?(@a += 1)
        //          ^^^^^^^
      case PM_INSTANCE_VARIABLE_OR_WRITE_NODE:
        // defined?(@a ||= 1)
        //          ^^^^^^^^
      case PM_INSTANCE_VARIABLE_WRITE_NODE:
        // defined?(@a = 1)
        //          ^^^^^^
      case PM_LOCAL_VARIABLE_AND_WRITE_NODE:
        // defined?(a &&= 1)
        //          ^^^^^^^
      case PM_LOCAL_VARIABLE_OPERATOR_WRITE_NODE:
        // defined?(a += 1)
        //          ^^^^^^
      case PM_LOCAL_VARIABLE_OR_WRITE_NODE:
        // defined?(a ||= 1)
        //          ^^^^^^^
      case PM_LOCAL_VARIABLE_WRITE_NODE:
        // defined?(a = 1)
        //          ^^^^^
      case PM_MULTI_WRITE_NODE:
        // defined?((a, = 1))
        //           ^^^^^^
        dtype = DEFINED_ASGN;
        break;
/* DEFINED_EXPR ***************************************************************/
      case PM_ALIAS_GLOBAL_VARIABLE_NODE:
        // defined?((alias $a $b))
        //           ^^^^^^^^^^^
      case PM_ALIAS_METHOD_NODE:
        // defined?((alias a b))
        //           ^^^^^^^^^
      case PM_AND_NODE:
        // defined?(a and b)
        //          ^^^^^^^
      case PM_BREAK_NODE:
        // defined?(break 1)
        //          ^^^^^^^
      case PM_CASE_MATCH_NODE:
        // defined?(case 1; in 1; end)
        //          ^^^^^^^^^^^^^^^^^
      case PM_CASE_NODE:
        // defined?(case 1; when 1; end)
        //          ^^^^^^^^^^^^^^^^^^^
      case PM_CLASS_NODE:
        // defined?(class Foo; end)
        //          ^^^^^^^^^^^^^^
      case PM_DEF_NODE:
        // defined?(def a() end)
        //          ^^^^^^^^^^^
      case PM_DEFINED_NODE:
        // defined?(defined?(a))
        //          ^^^^^^^^^^^
      case PM_FLIP_FLOP_NODE:
        // defined?(not (a .. b))
        //               ^^^^^^
      case PM_FLOAT_NODE:
        // defined?(1.0)
        //          ^^^
      case PM_FOR_NODE:
        // defined?(for a in 1 do end)
        //          ^^^^^^^^^^^^^^^^^
      case PM_IF_NODE:
        // defined?(if a then end)
        //          ^^^^^^^^^^^^^
      case PM_IMAGINARY_NODE:
        // defined?(1i)
        //          ^^
      case PM_INTEGER_NODE:
        // defined?(1)
        //          ^
      case PM_INTERPOLATED_MATCH_LAST_LINE_NODE:
        // defined?(not /#{1}/)
        //              ^^^^^^
      case PM_INTERPOLATED_REGULAR_EXPRESSION_NODE:
        // defined?(/#{1}/)
        //          ^^^^^^
      case PM_INTERPOLATED_STRING_NODE:
        // defined?("#{1}")
        //          ^^^^^^
      case PM_INTERPOLATED_SYMBOL_NODE:
        // defined?(:"#{1}")
        //          ^^^^^^^
      case PM_INTERPOLATED_X_STRING_NODE:
        // defined?(`#{1}`)
        //          ^^^^^^
      case PM_LAMBDA_NODE:
        // defined?(-> {})
        //          ^^^^^
      case PM_MATCH_LAST_LINE_NODE:
        // defined?(not //)
        //          ^^^^^^
      case PM_MATCH_PREDICATE_NODE:
        // defined?(1 in 1)
        //          ^^^^^^
      case PM_MATCH_REQUIRED_NODE:
        // defined?(1 => 1)
        //          ^^^^^^
      case PM_MATCH_WRITE_NODE:
        // defined?(/(?<a>)/ =~ "")
        //          ^^^^^^^^^^^^^^
      case PM_MODULE_NODE:
        // defined?(module A end)
        //          ^^^^^^^^^^^^
      case PM_NEXT_NODE:
        // defined?(next 1)
        //          ^^^^^^
      case PM_OR_NODE:
        // defined?(a or b)
        //          ^^^^^^
      case PM_POST_EXECUTION_NODE:
        // defined?((END {}))
        //          ^^^^^^^^
      case PM_RANGE_NODE:
        // defined?(1..1)
        //          ^^^^
      case PM_RATIONAL_NODE:
        // defined?(1r)
        //          ^^
      case PM_REDO_NODE:
        // defined?(redo)
        //          ^^^^
      case PM_REGULAR_EXPRESSION_NODE:
        // defined?(//)
        //          ^^
      case PM_RESCUE_MODIFIER_NODE:
        // defined?(a rescue b)
        //          ^^^^^^^^^^
      case PM_RETRY_NODE:
        // defined?(retry)
        //          ^^^^^
      case PM_RETURN_NODE:
        // defined?(return)
        //          ^^^^^^
      case PM_SINGLETON_CLASS_NODE:
        // defined?(class << self; end)
        //          ^^^^^^^^^^^^^^^^^^
      case PM_SOURCE_ENCODING_NODE:
        // defined?(__ENCODING__)
        //          ^^^^^^^^^^^^
      case PM_SOURCE_FILE_NODE:
        // defined?(__FILE__)
        //          ^^^^^^^^
      case PM_SOURCE_LINE_NODE:
        // defined?(__LINE__)
        //          ^^^^^^^^
      case PM_STRING_NODE:
        // defined?("")
        //          ^^
      case PM_SYMBOL_NODE:
        // defined?(:a)
        //          ^^
      case PM_UNDEF_NODE:
        // defined?((undef a))
        //           ^^^^^^^
      case PM_UNLESS_NODE:
        // defined?(unless a then end)
        //          ^^^^^^^^^^^^^^^^^
      case PM_UNTIL_NODE:
        // defined?(until a do end)
        //          ^^^^^^^^^^^^^^
      case PM_WHILE_NODE:
        // defined?(while a do end)
        //          ^^^^^^^^^^^^^^
      case PM_X_STRING_NODE:
        // defined?(``)
        //          ^^
        dtype = DEFINED_EXPR;
        break;
/* DEFINED_REF ****************************************************************/
      case PM_BACK_REFERENCE_READ_NODE: {
        // defined?($+)
        //          ^^
        const pm_back_reference_read_node_t *cast = (const pm_back_reference_read_node_t *) node;
        VALUE ref = pm_compile_back_reference_ref(scope_node, cast);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_REF), ref, PUSH_VAL(DEFINED_GVAR));
 
        return;
      }
      case PM_NUMBERED_REFERENCE_READ_NODE: {
        // defined?($1)
        //          ^^
        const pm_numbered_reference_read_node_t *cast = (const pm_numbered_reference_read_node_t *) node;
        VALUE ref = pm_compile_numbered_reference_ref(cast);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_REF), ref, PUSH_VAL(DEFINED_GVAR));
 
        return;
      }
/* DEFINED_CONST_FROM *********************************************************/
      case PM_CONSTANT_PATH_NODE: {
        // defined?(A::A)
        //          ^^^^
        const pm_constant_path_node_t *cast = (const pm_constant_path_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        if (cast->parent != NULL) {
            if (!lfinish[1]) lfinish[1] = NEW_LABEL(location.line);
            pm_compile_defined_expr0(iseq, cast->parent, node_location, ret, popped, scope_node, true, lfinish, false);
 
            PUSH_INSNL(ret, location, branchunless, lfinish[1]);
            PM_COMPILE(cast->parent);
        }
        else {
            PUSH_INSN1(ret, location, putobject, rb_cObject);
        }
 
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_CONST_FROM), ID2SYM(name), PUSH_VAL(DEFINED_CONST));
        return;
      }
/* Containers *****************************************************************/
      case PM_BEGIN_NODE: {
        // defined?(begin end)
        //          ^^^^^^^^^
        const pm_begin_node_t *cast = (const pm_begin_node_t *) node;
 
        if (cast->rescue_clause == NULL && cast->ensure_clause == NULL && cast->else_clause == NULL) {
            if (cast->statements == NULL) {
                // If we have empty statements, then we want to return "nil".
                dtype = DEFINED_NIL;
            }
            else if (cast->statements->body.size == 1) {
                // If we have a begin node that is wrapping a single statement
                // then we want to recurse down to that statement and compile
                // it.
                pm_compile_defined_expr0(iseq, cast->statements->body.nodes[0], node_location, ret, popped, scope_node, in_condition, lfinish, false);
                return;
            }
            else {
                // Otherwise, we have a begin wrapping multiple statements, in
                // which case this is defined as "expression".
                dtype = DEFINED_EXPR;
            }
        } else {
            // If we have any of the other clauses besides the main begin/end,
            // this is defined as "expression".
            dtype = DEFINED_EXPR;
        }
 
        break;
      }
      case PM_PARENTHESES_NODE: {
        // defined?(())
        //          ^^
        const pm_parentheses_node_t *cast = (const pm_parentheses_node_t *) node;
 
        if (cast->body == NULL) {
            // If we have empty parentheses, then we want to return "nil".
            dtype = DEFINED_NIL;
        }
        else if (PM_NODE_TYPE_P(cast->body, PM_STATEMENTS_NODE) && !PM_NODE_FLAG_P(cast, PM_PARENTHESES_NODE_FLAGS_MULTIPLE_STATEMENTS)) {
            // If we have a parentheses node that is wrapping a single statement
            // then we want to recurse down to that statement and compile it.
            pm_compile_defined_expr0(iseq, ((const pm_statements_node_t *) cast->body)->body.nodes[0], node_location, ret, popped, scope_node, in_condition, lfinish, false);
            return;
        }
        else {
            // Otherwise, we have parentheses wrapping multiple statements, in
            // which case this is defined as "expression".
            dtype = DEFINED_EXPR;
        }
 
        break;
      }
      case PM_ARRAY_NODE: {
        // defined?([])
        //          ^^
        const pm_array_node_t *cast = (const pm_array_node_t *) node;
 
        if (cast->elements.size > 0 && !lfinish[1]) {
            lfinish[1] = NEW_LABEL(location.line);
        }
 
        for (size_t index = 0; index < cast->elements.size; index++) {
            pm_compile_defined_expr0(iseq, cast->elements.nodes[index], node_location, ret, popped, scope_node, true, lfinish, false);
            PUSH_INSNL(ret, location, branchunless, lfinish[1]);
        }
 
        dtype = DEFINED_EXPR;
        break;
      }
      case PM_HASH_NODE:
        // defined?({ a: 1 })
        //          ^^^^^^^^
      case PM_KEYWORD_HASH_NODE: {
        // defined?(a(a: 1))
        //            ^^^^
        const pm_node_list_t *elements;
 
        if (PM_NODE_TYPE_P(node, PM_HASH_NODE)) {
            elements = &((const pm_hash_node_t *) node)->elements;
        }
        else {
            elements = &((const pm_keyword_hash_node_t *) node)->elements;
        }
 
        if (elements->size > 0 && !lfinish[1]) {
            lfinish[1] = NEW_LABEL(location.line);
        }
 
        for (size_t index = 0; index < elements->size; index++) {
            pm_compile_defined_expr0(iseq, elements->nodes[index], node_location, ret, popped, scope_node, true, lfinish, false);
            PUSH_INSNL(ret, location, branchunless, lfinish[1]);
        }
 
        dtype = DEFINED_EXPR;
        break;
      }
      case PM_ASSOC_NODE: {
        // defined?({ a: 1 })
        //            ^^^^
        const pm_assoc_node_t *cast = (const pm_assoc_node_t *) node;
 
        pm_compile_defined_expr0(iseq, cast->key, node_location, ret, popped, scope_node, true, lfinish, false);
        PUSH_INSNL(ret, location, branchunless, lfinish[1]);
        pm_compile_defined_expr0(iseq, cast->value, node_location, ret, popped, scope_node, true, lfinish, false);
 
        return;
      }
      case PM_ASSOC_SPLAT_NODE: {
        // defined?({ **a })
        //            ^^^^
        const pm_assoc_splat_node_t *cast = (const pm_assoc_splat_node_t *) node;
 
        if (cast->value == NULL) {
            dtype = DEFINED_EXPR;
            break;
        }
 
        pm_compile_defined_expr0(iseq, cast->value, node_location, ret, popped, scope_node, true, lfinish, false);
        return;
      }
      case PM_IMPLICIT_NODE: {
        // defined?({ a: })
        //            ^^
        const pm_implicit_node_t *cast = (const pm_implicit_node_t *) node;
        pm_compile_defined_expr0(iseq, cast->value, node_location, ret, popped, scope_node, in_condition, lfinish, false);
        return;
      }
      case PM_CALL_NODE: {
#define BLOCK_P(cast) ((cast)->block != NULL && PM_NODE_TYPE_P((cast)->block, PM_BLOCK_NODE))
 
        // defined?(a(1, 2, 3))
        //          ^^^^^^^^^^
        const pm_call_node_t *cast = ((const pm_call_node_t *) node);
 
        if (BLOCK_P(cast)) {
            dtype = DEFINED_EXPR;
            break;
        }
 
        if (cast->receiver || cast->arguments || (cast->block && PM_NODE_TYPE_P(cast->block, PM_BLOCK_ARGUMENT_NODE))) {
            if (!lfinish[1]) lfinish[1] = NEW_LABEL(location.line);
            if (!lfinish[2]) lfinish[2] = NEW_LABEL(location.line);
        }
 
        if (cast->arguments) {
            pm_compile_defined_expr0(iseq, (const pm_node_t *) cast->arguments, node_location, ret, popped, scope_node, true, lfinish, false);
            PUSH_INSNL(ret, location, branchunless, lfinish[1]);
        }
 
        if (cast->block && PM_NODE_TYPE_P(cast->block, PM_BLOCK_ARGUMENT_NODE)) {
            pm_compile_defined_expr0(iseq, cast->block, node_location, ret, popped, scope_node, true, lfinish, false);
            PUSH_INSNL(ret, location, branchunless, lfinish[1]);
        }
 
        if (cast->receiver) {
            if (PM_NODE_TYPE_P(cast->receiver, PM_CALL_NODE) && !BLOCK_P((const pm_call_node_t *) cast->receiver)) {
                // Special behavior here where we chain calls together. This is
                // the only path that sets explicit_receiver to true.
                pm_compile_defined_expr0(iseq, cast->receiver, node_location, ret, popped, scope_node, true, lfinish, true);
                PUSH_INSNL(ret, location, branchunless, lfinish[2]);
 
                const pm_call_node_t *receiver = (const pm_call_node_t *) cast->receiver;
                ID method_id = pm_constant_id_lookup(scope_node, receiver->name);
 
                pm_compile_call(iseq, receiver, ret, popped, scope_node, method_id, NULL);
            }
            else {
                pm_compile_defined_expr0(iseq, cast->receiver, node_location, ret, popped, scope_node, true, lfinish, false);
                PUSH_INSNL(ret, location, branchunless, lfinish[1]);
                PM_COMPILE(cast->receiver);
            }
 
            ID method_id = pm_constant_id_lookup(scope_node, cast->name);
 
            if (explicit_receiver) PUSH_INSN(ret, location, dup);
            PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_METHOD), rb_id2sym(method_id), PUSH_VAL(DEFINED_METHOD));
        }
        else {
            ID method_id = pm_constant_id_lookup(scope_node, cast->name);
 
            PUSH_INSN(ret, location, putself);
            if (explicit_receiver) PUSH_INSN(ret, location, dup);
 
            PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_FUNC), rb_id2sym(method_id), PUSH_VAL(DEFINED_METHOD));
        }
 
        return;
 
#undef BLOCK_P
      }
      case PM_ARGUMENTS_NODE: {
        // defined?(a(1, 2, 3))
        //            ^^^^^^^
        const pm_arguments_node_t *cast = (const pm_arguments_node_t *) node;
 
        for (size_t index = 0; index < cast->arguments.size; index++) {
            pm_compile_defined_expr0(iseq, cast->arguments.nodes[index], node_location, ret, popped, scope_node, in_condition, lfinish, false);
            PUSH_INSNL(ret, location, branchunless, lfinish[1]);
        }
 
        dtype = DEFINED_EXPR;
        break;
      }
      case PM_BLOCK_ARGUMENT_NODE:
        // defined?(a(&b))
        //            ^^
        dtype = DEFINED_EXPR;
        break;
      case PM_FORWARDING_ARGUMENTS_NODE:
        // def a(...) = defined?(a(...))
        //                         ^^^
        dtype = DEFINED_EXPR;
        break;
      case PM_SPLAT_NODE: {
        // def a(*) = defined?(a(*))
        //                       ^
        const pm_splat_node_t *cast = (const pm_splat_node_t *) node;
 
        if (cast->expression == NULL) {
            dtype = DEFINED_EXPR;
            break;
        }
 
        pm_compile_defined_expr0(iseq, cast->expression, node_location, ret, popped, scope_node, in_condition, lfinish, false);
 
        if (!lfinish[1]) lfinish[1] = NEW_LABEL(location.line);
        PUSH_INSNL(ret, location, branchunless, lfinish[1]);
 
        dtype = DEFINED_EXPR;
        break;
      }
      case PM_SHAREABLE_CONSTANT_NODE:
        // # shareable_constant_value: literal
        // defined?(A = 1)
        //          ^^^^^
        pm_compile_defined_expr0(iseq, ((const pm_shareable_constant_node_t *) node)->write, node_location, ret, popped, scope_node, in_condition, lfinish, explicit_receiver);
        return;
/* Unreachable (parameters) ***************************************************/
      case PM_BLOCK_LOCAL_VARIABLE_NODE:
      case PM_BLOCK_PARAMETER_NODE:
      case PM_BLOCK_PARAMETERS_NODE:
      case PM_FORWARDING_PARAMETER_NODE:
      case PM_IMPLICIT_REST_NODE:
      case PM_IT_PARAMETERS_NODE:
      case PM_PARAMETERS_NODE:
      case PM_KEYWORD_REST_PARAMETER_NODE:
      case PM_NO_KEYWORDS_PARAMETER_NODE:
      case PM_NO_BLOCK_PARAMETER_NODE:
      case PM_NUMBERED_PARAMETERS_NODE:
      case PM_OPTIONAL_KEYWORD_PARAMETER_NODE:
      case PM_OPTIONAL_PARAMETER_NODE:
      case PM_REQUIRED_KEYWORD_PARAMETER_NODE:
      case PM_REQUIRED_PARAMETER_NODE:
      case PM_REST_PARAMETER_NODE:
/* Unreachable (pattern matching) *********************************************/
      case PM_ALTERNATION_PATTERN_NODE:
      case PM_ARRAY_PATTERN_NODE:
      case PM_CAPTURE_PATTERN_NODE:
      case PM_FIND_PATTERN_NODE:
      case PM_HASH_PATTERN_NODE:
      case PM_PINNED_EXPRESSION_NODE:
      case PM_PINNED_VARIABLE_NODE:
/* Unreachable (indirect writes) **********************************************/
      case PM_CALL_TARGET_NODE:
      case PM_CLASS_VARIABLE_TARGET_NODE:
      case PM_CONSTANT_PATH_TARGET_NODE:
      case PM_CONSTANT_TARGET_NODE:
      case PM_GLOBAL_VARIABLE_TARGET_NODE:
      case PM_INDEX_TARGET_NODE:
      case PM_INSTANCE_VARIABLE_TARGET_NODE:
      case PM_LOCAL_VARIABLE_TARGET_NODE:
      case PM_MULTI_TARGET_NODE:
/* Unreachable (clauses) ******************************************************/
      case PM_ELSE_NODE:
      case PM_ENSURE_NODE:
      case PM_IN_NODE:
      case PM_RESCUE_NODE:
      case PM_WHEN_NODE:
/* Unreachable (miscellaneous) ************************************************/
      case PM_BLOCK_NODE:
      case PM_EMBEDDED_STATEMENTS_NODE:
      case PM_EMBEDDED_VARIABLE_NODE:
      case PM_ERROR_RECOVERY_NODE:
      case PM_PRE_EXECUTION_NODE:
      case PM_PROGRAM_NODE:
      case PM_SCOPE_NODE:
      case PM_STATEMENTS_NODE:
        rb_bug("Unreachable node in defined?: %s", pm_node_type(PM_NODE_TYPE(node)));
    }
 
    RUBY_ASSERT(dtype != DEFINED_NOT_DEFINED);
    PUSH_INSN1(ret, location, putobject, PUSH_VAL(dtype));
 
#undef PUSH_VAL
}
 
static void
pm_defined_expr(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node, bool in_condition, LABEL **lfinish)
{
    LINK_ELEMENT *lcur = ret->last;
    pm_compile_defined_expr0(iseq, node, node_location, ret, popped, scope_node, in_condition, lfinish, false);
 
    if (lfinish[1]) {
        LABEL *lstart = NEW_LABEL(node_location->line);
        LABEL *lend = NEW_LABEL(node_location->line);
 
        struct rb_iseq_new_with_callback_callback_func *ifunc =
            rb_iseq_new_with_callback_new_callback(build_defined_rescue_iseq, NULL);
 
        const rb_iseq_t *rescue = new_child_iseq_with_callback(
            iseq,
            ifunc,
            rb_str_concat(rb_str_new2("defined guard in "), ISEQ_BODY(iseq)->location.label),
            iseq,
            ISEQ_TYPE_RESCUE,
            0
        );
 
        lstart->rescued = LABEL_RESCUE_BEG;
        lend->rescued = LABEL_RESCUE_END;
 
        APPEND_LABEL(ret, lcur, lstart);
        PUSH_LABEL(ret, lend);
        PUSH_CATCH_ENTRY(CATCH_TYPE_RESCUE, lstart, lend, rescue, lfinish[1]);
    }
}
 
static void
pm_compile_defined_expr(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node, bool in_condition)
{
    LABEL *lfinish[3];
    LINK_ELEMENT *last = ret->last;
 
    lfinish[0] = NEW_LABEL(node_location->line);
    lfinish[1] = 0;
    lfinish[2] = 0;
 
    if (!popped) {
        pm_defined_expr(iseq, node, node_location, ret, popped, scope_node, in_condition, lfinish);
    }
 
    if (lfinish[1]) {
        ELEM_INSERT_NEXT(last, &new_insn_body(iseq, node_location->line, node_location->node_id, BIN(putnil), 0)->link);
        PUSH_INSN(ret, *node_location, swap);
 
        if (lfinish[2]) PUSH_LABEL(ret, lfinish[2]);
        PUSH_INSN(ret, *node_location, pop);
        PUSH_LABEL(ret, lfinish[1]);
 
    }
 
    PUSH_LABEL(ret, lfinish[0]);
}
 
// This is exactly the same as add_ensure_iseq, except it compiled
// the node as a Prism node, and not a CRuby node
static void
pm_add_ensure_iseq(LINK_ANCHOR *const ret, rb_iseq_t *iseq, int is_return, pm_scope_node_t *scope_node)
{
    RUBY_ASSERT(can_add_ensure_iseq(iseq));
 
    struct iseq_compile_data_ensure_node_stack *enlp =
        ISEQ_COMPILE_DATA(iseq)->ensure_node_stack;
    struct iseq_compile_data_ensure_node_stack *prev_enlp = enlp;
    DECL_ANCHOR(ensure);
 
    while (enlp) {
        if (enlp->erange != NULL) {
            DECL_ANCHOR(ensure_part);
            LABEL *lstart = NEW_LABEL(0);
            LABEL *lend = NEW_LABEL(0);
 
            add_ensure_range(iseq, enlp->erange, lstart, lend);
 
            ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = enlp->prev;
            PUSH_LABEL(ensure_part, lstart);
            bool popped = true;
            PM_COMPILE_INTO_ANCHOR(ensure_part, (const pm_node_t *) enlp->ensure_node);
            PUSH_LABEL(ensure_part, lend);
            PUSH_SEQ(ensure, ensure_part);
        }
        else {
            if (!is_return) {
                break;
            }
        }
        enlp = enlp->prev;
    }
    ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = prev_enlp;
    PUSH_SEQ(ret, ensure);
}
 
 
 
static void
pm_insert_local_index(pm_constant_id_t constant_id, int local_index, pm_index_lookup_table_t *index_lookup_table, rb_ast_id_table_t *local_table_for_iseq, pm_scope_node_t *scope_node)
{
    RUBY_ASSERT((constant_id & PM_SPECIAL_CONSTANT_FLAG) == 0);
 
    ID local = pm_constant_id_lookup(scope_node, constant_id);
    local_table_for_iseq->ids[local_index] = local;
    pm_index_lookup_table_insert(index_lookup_table, constant_id, local_index);
}
 
static void
pm_insert_local_special(pm_constant_id_t special_id, ID local_name, int local_index, pm_index_lookup_table_t *index_lookup_table, rb_ast_id_table_t *local_table_for_iseq)
{
    local_table_for_iseq->ids[local_index] = local_name;
    pm_index_lookup_table_insert(index_lookup_table, special_id, local_index);
}
 
static int
pm_compile_destructured_param_locals(const pm_multi_target_node_t *node, pm_index_lookup_table_t *index_lookup_table, rb_ast_id_table_t *local_table_for_iseq, pm_scope_node_t *scope_node, int local_index)
{
    for (size_t index = 0; index < node->lefts.size; index++) {
        const pm_node_t *left = node->lefts.nodes[index];
 
        if (PM_NODE_TYPE_P(left, PM_REQUIRED_PARAMETER_NODE)) {
            if (!PM_NODE_FLAG_P(left, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                pm_insert_local_index(((const pm_required_parameter_node_t *) left)->name, local_index, index_lookup_table, local_table_for_iseq, scope_node);
                local_index++;
            }
        }
        else {
            RUBY_ASSERT(PM_NODE_TYPE_P(left, PM_MULTI_TARGET_NODE));
            local_index = pm_compile_destructured_param_locals((const pm_multi_target_node_t *) left, index_lookup_table, local_table_for_iseq, scope_node, local_index);
        }
    }
 
    if (node->rest != NULL && PM_NODE_TYPE_P(node->rest, PM_SPLAT_NODE)) {
        const pm_splat_node_t *rest = (const pm_splat_node_t *) node->rest;
 
        if (rest->expression != NULL) {
            RUBY_ASSERT(PM_NODE_TYPE_P(rest->expression, PM_REQUIRED_PARAMETER_NODE));
 
            if (!PM_NODE_FLAG_P(rest->expression, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                pm_insert_local_index(((const pm_required_parameter_node_t *) rest->expression)->name, local_index, index_lookup_table, local_table_for_iseq, scope_node);
                local_index++;
            }
        }
    }
 
    for (size_t index = 0; index < node->rights.size; index++) {
        const pm_node_t *right = node->rights.nodes[index];
 
        if (PM_NODE_TYPE_P(right, PM_REQUIRED_PARAMETER_NODE)) {
            if (!PM_NODE_FLAG_P(right, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                pm_insert_local_index(((const pm_required_parameter_node_t *) right)->name, local_index, index_lookup_table, local_table_for_iseq, scope_node);
                local_index++;
            }
        }
        else {
            RUBY_ASSERT(PM_NODE_TYPE_P(right, PM_MULTI_TARGET_NODE));
            local_index = pm_compile_destructured_param_locals((const pm_multi_target_node_t *) right, index_lookup_table, local_table_for_iseq, scope_node, local_index);
        }
    }
 
    return local_index;
}
 
static inline void
pm_compile_destructured_param_write(rb_iseq_t *iseq, const pm_required_parameter_node_t *node, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, node->name, 0);
    PUSH_SETLOCAL(ret, location, index.index, index.level);
}
 
static void
pm_compile_destructured_param_writes(rb_iseq_t *iseq, const pm_multi_target_node_t *node, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    bool has_rest = (node->rest && PM_NODE_TYPE_P(node->rest, PM_SPLAT_NODE) && (((const pm_splat_node_t *) node->rest)->expression) != NULL);
    bool has_rights = node->rights.size > 0;
 
    int flag = (has_rest || has_rights) ? 1 : 0;
    PUSH_INSN2(ret, location, expandarray, INT2FIX(node->lefts.size), INT2FIX(flag));
 
    for (size_t index = 0; index < node->lefts.size; index++) {
        const pm_node_t *left = node->lefts.nodes[index];
 
        if (PM_NODE_TYPE_P(left, PM_REQUIRED_PARAMETER_NODE)) {
            pm_compile_destructured_param_write(iseq, (const pm_required_parameter_node_t *) left, ret, scope_node);
        }
        else {
            RUBY_ASSERT(PM_NODE_TYPE_P(left, PM_MULTI_TARGET_NODE));
            pm_compile_destructured_param_writes(iseq, (const pm_multi_target_node_t *) left, ret, scope_node);
        }
    }
 
    if (has_rest) {
        if (has_rights) {
            PUSH_INSN2(ret, location, expandarray, INT2FIX(node->rights.size), INT2FIX(3));
        }
 
        const pm_node_t *rest = ((const pm_splat_node_t *) node->rest)->expression;
        RUBY_ASSERT(PM_NODE_TYPE_P(rest, PM_REQUIRED_PARAMETER_NODE));
 
        pm_compile_destructured_param_write(iseq, (const pm_required_parameter_node_t *) rest, ret, scope_node);
    }
 
    if (has_rights) {
        if (!has_rest) {
            PUSH_INSN2(ret, location, expandarray, INT2FIX(node->rights.size), INT2FIX(2));
        }
 
        for (size_t index = 0; index < node->rights.size; index++) {
            const pm_node_t *right = node->rights.nodes[index];
 
            if (PM_NODE_TYPE_P(right, PM_REQUIRED_PARAMETER_NODE)) {
                pm_compile_destructured_param_write(iseq, (const pm_required_parameter_node_t *) right, ret, scope_node);
            }
            else {
                RUBY_ASSERT(PM_NODE_TYPE_P(right, PM_MULTI_TARGET_NODE));
                pm_compile_destructured_param_writes(iseq, (const pm_multi_target_node_t *) right, ret, scope_node);
            }
        }
    }
}
 
typedef struct pm_multi_target_state_node {
    // The pointer to the topn instruction that will need to be modified after
    // we know the total stack size of all of the targets.
    INSN *topn;
 
    // The index of the stack from the base of the entire multi target at which
    // the parent expression is located.
    size_t stack_index;
 
    // The number of slots in the stack that this node occupies.
    size_t stack_size;
 
    // The position of the node in the list of targets.
    size_t position;
 
    // A pointer to the next node in this linked list.
    struct pm_multi_target_state_node *next;
} pm_multi_target_state_node_t;
 
typedef struct {
    // The total number of slots in the stack that this multi target occupies.
    size_t stack_size;
 
    // The position of the current node being compiled. This is forwarded to
    // nodes when they are allocated.
    size_t position;
 
    // A pointer to the head of this linked list.
    pm_multi_target_state_node_t *head;
 
    // A pointer to the tail of this linked list.
    pm_multi_target_state_node_t *tail;
} pm_multi_target_state_t;
 
static void
pm_multi_target_state_push(pm_multi_target_state_t *state, INSN *topn, size_t stack_size)
{
    pm_multi_target_state_node_t *node = ALLOC(pm_multi_target_state_node_t);
    node->topn = topn;
    node->stack_index = state->stack_size + 1;
    node->stack_size = stack_size;
    node->position = state->position;
    node->next = NULL;
 
    if (state->head == NULL) {
        state->head = node;
        state->tail = node;
    }
    else {
        state->tail->next = node;
        state->tail = node;
    }
 
    state->stack_size += stack_size;
}
 
static void
pm_multi_target_state_update(pm_multi_target_state_t *state)
{
    // If nothing was ever pushed onto the stack, then we don't need to do any
    // kind of updates.
    if (state->stack_size == 0) return;
 
    pm_multi_target_state_node_t *current = state->head;
    pm_multi_target_state_node_t *previous;
 
    while (current != NULL) {
        VALUE offset = INT2FIX(state->stack_size - current->stack_index + current->position);
        current->topn->operands[0] = offset;
 
        // stack_size will be > 1 in the case that we compiled an index target
        // and it had arguments. In this case, we use multiple topn instructions
        // to grab up all of the arguments as well, so those offsets need to be
        // updated as well.
        if (current->stack_size > 1) {
            INSN *insn = current->topn;
 
            for (size_t index = 1; index < current->stack_size; index += 1) {
                LINK_ELEMENT *element = get_next_insn(insn);
                RUBY_ASSERT(IS_INSN(element));
 
                insn = (INSN *) element;
                RUBY_ASSERT(insn->insn_id == BIN(topn));
 
                insn->operands[0] = offset;
            }
        }
 
        previous = current;
        current = current->next;
 
        SIZED_FREE(previous);
    }
}
 
static void
pm_compile_multi_target_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const parents, LINK_ANCHOR *const writes, LINK_ANCHOR *const cleanup, pm_scope_node_t *scope_node, pm_multi_target_state_t *state);
 
static void
pm_compile_target_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const parents, LINK_ANCHOR *const writes, LINK_ANCHOR *const cleanup, pm_scope_node_t *scope_node, pm_multi_target_state_t *state)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    switch (PM_NODE_TYPE(node)) {
      case PM_LOCAL_VARIABLE_TARGET_NODE: {
        // Local variable targets have no parent expression, so they only need
        // to compile the write.
        //
        //     for i in []; end
        //
        const pm_local_variable_target_node_t *cast = (const pm_local_variable_target_node_t *) node;
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
 
        PUSH_SETLOCAL(writes, location, index.index, index.level);
        break;
      }
      case PM_CLASS_VARIABLE_TARGET_NODE: {
        // Class variable targets have no parent expression, so they only need
        // to compile the write.
        //
        //     for @@i in []; end
        //
        const pm_class_variable_target_node_t *cast = (const pm_class_variable_target_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        VALUE operand = ID2SYM(name);
        PUSH_INSN2(writes, location, setclassvariable, operand, get_cvar_ic_value(iseq, name));
        break;
      }
      case PM_CONSTANT_TARGET_NODE: {
        // Constant targets have no parent expression, so they only need to
        // compile the write.
        //
        //     for I in []; end
        //
        const pm_constant_target_node_t *cast = (const pm_constant_target_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        VALUE operand = ID2SYM(name);
        PUSH_INSN1(writes, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
        PUSH_INSN1(writes, location, setconstant, operand);
        break;
      }
      case PM_GLOBAL_VARIABLE_TARGET_NODE: {
        // Global variable targets have no parent expression, so they only need
        // to compile the write.
        //
        //     for $i in []; end
        //
        const pm_global_variable_target_node_t *cast = (const pm_global_variable_target_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        VALUE operand = ID2SYM(name);
        PUSH_INSN1(writes, location, setglobal, operand);
        break;
      }
      case PM_INSTANCE_VARIABLE_TARGET_NODE: {
        // Instance variable targets have no parent expression, so they only
        // need to compile the write.
        //
        //     for @i in []; end
        //
        const pm_instance_variable_target_node_t *cast = (const pm_instance_variable_target_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        VALUE operand = ID2SYM(name);
        PUSH_INSN2(writes, location, setinstancevariable, operand, get_ivar_ic_value(iseq, name));
        break;
      }
      case PM_CONSTANT_PATH_TARGET_NODE: {
        // Constant path targets have a parent expression that is the object
        // that owns the constant. This needs to be compiled first into the
        // parents sequence. If no parent is found, then it represents using the
        // unary :: operator to indicate a top-level constant. In that case we
        // need to push Object onto the stack.
        //
        //     for I::J in []; end
        //
        const pm_constant_path_target_node_t *cast = (const pm_constant_path_target_node_t *) node;
        ID name = pm_constant_id_lookup(scope_node, cast->name);
 
        if (cast->parent != NULL) {
            pm_compile_node(iseq, cast->parent, parents, false, scope_node);
        }
        else {
            PUSH_INSN1(parents, location, putobject, rb_cObject);
        }
 
        if (state == NULL) {
            PUSH_INSN(writes, location, swap);
        }
        else {
            PUSH_INSN1(writes, location, topn, INT2FIX(1));
            pm_multi_target_state_push(state, (INSN *) LAST_ELEMENT(writes), 1);
        }
 
        VALUE operand = ID2SYM(name);
        PUSH_INSN1(writes, location, setconstant, operand);
 
        if (state != NULL) {
            PUSH_INSN(cleanup, location, pop);
        }
 
        break;
      }
      case PM_CALL_TARGET_NODE: {
        // Call targets have a parent expression that is the receiver of the
        // method being called. This needs to be compiled first into the parents
        // sequence. These nodes cannot have arguments, so the method call is
        // compiled with a single argument which represents the value being
        // written.
        //
        //     for i.j in []; end
        //
        const pm_call_target_node_t *cast = (const pm_call_target_node_t *) node;
        ID method_id = pm_constant_id_lookup(scope_node, cast->name);
 
        pm_compile_node(iseq, cast->receiver, parents, false, scope_node);
 
        LABEL *safe_label = NULL;
        if (PM_NODE_FLAG_P(cast, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION)) {
            safe_label = NEW_LABEL(location.line);
            PUSH_INSN(parents, location, dup);
            PUSH_INSNL(parents, location, branchnil, safe_label);
        }
 
        if (state != NULL) {
            PUSH_INSN1(writes, location, topn, INT2FIX(1));
            pm_multi_target_state_push(state, (INSN *) LAST_ELEMENT(writes), 1);
            PUSH_INSN(writes, location, swap);
        }
 
        int flags = VM_CALL_ARGS_SIMPLE;
        if (PM_NODE_FLAG_P(cast, PM_CALL_NODE_FLAGS_IGNORE_VISIBILITY)) flags |= VM_CALL_FCALL;
 
        PUSH_SEND_WITH_FLAG(writes, location, method_id, INT2FIX(1), INT2FIX(flags));
        if (safe_label != NULL && state == NULL) PUSH_LABEL(writes, safe_label);
        PUSH_INSN(writes, location, pop);
        if (safe_label != NULL && state != NULL) PUSH_LABEL(writes, safe_label);
 
        if (state != NULL) {
            PUSH_INSN(cleanup, location, pop);
        }
 
        break;
      }
      case PM_INDEX_TARGET_NODE: {
        // Index targets have a parent expression that is the receiver of the
        // method being called and any additional arguments that are being
        // passed along with the value being written. The receiver and arguments
        // both need to be on the stack. Note that this is even more complicated
        // by the fact that these nodes can hold a block using the unary &
        // operator.
        //
        //     for i[:j] in []; end
        //
        const pm_index_target_node_t *cast = (const pm_index_target_node_t *) node;
 
        pm_compile_node(iseq, cast->receiver, parents, false, scope_node);
 
        int flags = 0;
        struct rb_callinfo_kwarg *kwargs = NULL;
        int argc = pm_setup_args(cast->arguments, (const pm_node_t *) cast->block, &flags, &kwargs, iseq, parents, scope_node, &location);
 
        if (state != NULL) {
            PUSH_INSN1(writes, location, topn, INT2FIX(argc + 1));
            pm_multi_target_state_push(state, (INSN *) LAST_ELEMENT(writes), argc + 1);
 
            if (argc == 0) {
                PUSH_INSN(writes, location, swap);
            }
            else {
                for (int index = 0; index < argc; index++) {
                    PUSH_INSN1(writes, location, topn, INT2FIX(argc + 1));
                }
                PUSH_INSN1(writes, location, topn, INT2FIX(argc + 1));
            }
        }
 
        // The argc that we're going to pass to the send instruction is the
        // number of arguments + 1 for the value being written. If there's a
        // splat, then we need to insert newarray and concatarray instructions
        // after the arguments have been written.
        int ci_argc = argc + 1;
        if (flags & VM_CALL_ARGS_SPLAT) {
            ci_argc--;
            PUSH_INSN1(writes, location, newarray, INT2FIX(1));
            PUSH_INSN(writes, location, concatarray);
        }
 
        PUSH_SEND_R(writes, location, idASET, INT2NUM(ci_argc), NULL, INT2FIX(flags), kwargs);
        PUSH_INSN(writes, location, pop);
 
        if (state != NULL) {
            if (argc != 0) {
                PUSH_INSN(writes, location, pop);
            }
 
            for (int index = 0; index < argc + 1; index++) {
                PUSH_INSN(cleanup, location, pop);
            }
        }
 
        break;
      }
      case PM_MULTI_TARGET_NODE: {
        // Multi target nodes represent a set of writes to multiple variables.
        // The parent expressions are the combined set of the parent expressions
        // of its inner target nodes.
        //
        //     for i, j in []; end
        //
        size_t before_position;
        if (state != NULL) {
            before_position = state->position;
            state->position--;
        }
 
        pm_compile_multi_target_node(iseq, node, parents, writes, cleanup, scope_node, state);
        if (state != NULL) state->position = before_position;
 
        break;
      }
      case PM_SPLAT_NODE: {
        // Splat nodes capture all values into an array. They can be used
        // as targets in assignments or for loops.
        //
        //     for *x in []; end
        //
        const pm_splat_node_t *cast = (const pm_splat_node_t *) node;
 
        if (cast->expression != NULL) {
            pm_compile_target_node(iseq, cast->expression, parents, writes, cleanup, scope_node, state);
        }
 
        break;
      }
      default:
        rb_bug("Unexpected node type: %s", pm_node_type(PM_NODE_TYPE(node)));
        break;
    }
}
 
static void
pm_compile_multi_target_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const parents, LINK_ANCHOR *const writes, LINK_ANCHOR *const cleanup, pm_scope_node_t *scope_node, pm_multi_target_state_t *state)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    const pm_node_list_t *lefts;
    const pm_node_t *rest;
    const pm_node_list_t *rights;
 
    switch (PM_NODE_TYPE(node)) {
      case PM_MULTI_TARGET_NODE: {
        const pm_multi_target_node_t *cast = (const pm_multi_target_node_t *) node;
        lefts = &cast->lefts;
        rest = cast->rest;
        rights = &cast->rights;
        break;
      }
      case PM_MULTI_WRITE_NODE: {
        const pm_multi_write_node_t *cast = (const pm_multi_write_node_t *) node;
        lefts = &cast->lefts;
        rest = cast->rest;
        rights = &cast->rights;
        break;
      }
      default:
        rb_bug("Unsupported node %s", pm_node_type(PM_NODE_TYPE(node)));
        break;
    }
 
    bool has_rest = (rest != NULL) && PM_NODE_TYPE_P(rest, PM_SPLAT_NODE) && ((const pm_splat_node_t *) rest)->expression != NULL;
    bool has_posts = rights->size > 0;
 
    // The first instruction in the writes sequence is going to spread the
    // top value of the stack onto the number of values that we're going to
    // write.
    PUSH_INSN2(writes, location, expandarray, INT2FIX(lefts->size), INT2FIX((has_rest || has_posts) ? 1 : 0));
 
    // We need to keep track of some additional state information as we're
    // going through the targets because we will need to revisit them once
    // we know how many values are being pushed onto the stack.
    pm_multi_target_state_t target_state = { 0 };
    if (state == NULL) state = &target_state;
 
    size_t base_position = state->position;
    size_t splat_position = (has_rest || has_posts) ? 1 : 0;
 
    // Next, we'll iterate through all of the leading targets.
    for (size_t index = 0; index < lefts->size; index++) {
        const pm_node_t *target = lefts->nodes[index];
        state->position = lefts->size - index + splat_position + base_position;
        pm_compile_target_node(iseq, target, parents, writes, cleanup, scope_node, state);
    }
 
    // Next, we'll compile the rest target if there is one.
    if (has_rest) {
        const pm_node_t *target = ((const pm_splat_node_t *) rest)->expression;
        state->position = 1 + rights->size + base_position;
 
        if (has_posts) {
            PUSH_INSN2(writes, location, expandarray, INT2FIX(rights->size), INT2FIX(3));
        }
 
        pm_compile_target_node(iseq, target, parents, writes, cleanup, scope_node, state);
    }
 
    // Finally, we'll compile the trailing targets.
    if (has_posts) {
        if (!has_rest && rest != NULL) {
            PUSH_INSN2(writes, location, expandarray, INT2FIX(rights->size), INT2FIX(2));
        }
 
        for (size_t index = 0; index < rights->size; index++) {
            const pm_node_t *target = rights->nodes[index];
            state->position = rights->size - index + base_position;
            pm_compile_target_node(iseq, target, parents, writes, cleanup, scope_node, state);
        }
    }
}
 
static void
pm_compile_for_node_index(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    switch (PM_NODE_TYPE(node)) {
      case PM_LOCAL_VARIABLE_TARGET_NODE: {
        // For local variables, all we have to do is retrieve the value and then
        // compile the index node.
        PUSH_GETLOCAL(ret, location, 1, 0);
        pm_compile_target_node(iseq, node, ret, ret, ret, scope_node, NULL);
        break;
      }
      case PM_CLASS_VARIABLE_TARGET_NODE:
      case PM_CONSTANT_TARGET_NODE:
      case PM_GLOBAL_VARIABLE_TARGET_NODE:
      case PM_INSTANCE_VARIABLE_TARGET_NODE:
      case PM_CONSTANT_PATH_TARGET_NODE:
      case PM_CALL_TARGET_NODE:
      case PM_INDEX_TARGET_NODE: {
        // For other targets, we need to potentially compile the parent or
        // owning expression of this target, then retrieve the value, expand it,
        // and then compile the necessary writes.
        DECL_ANCHOR(writes);
        DECL_ANCHOR(cleanup);
 
        pm_multi_target_state_t state = { 0 };
        state.position = 1;
        pm_compile_target_node(iseq, node, ret, writes, cleanup, scope_node, &state);
 
        PUSH_GETLOCAL(ret, location, 1, 0);
        PUSH_INSN2(ret, location, expandarray, INT2FIX(1), INT2FIX(0));
 
        PUSH_SEQ(ret, writes);
        PUSH_SEQ(ret, cleanup);
 
        pm_multi_target_state_update(&state);
        break;
      }
      case PM_SPLAT_NODE:
      case PM_MULTI_TARGET_NODE: {
        DECL_ANCHOR(writes);
        DECL_ANCHOR(cleanup);
 
        pm_compile_target_node(iseq, node, ret, writes, cleanup, scope_node, NULL);
 
        LABEL *not_single = NEW_LABEL(location.line);
        LABEL *not_ary = NEW_LABEL(location.line);
 
        // When there are multiple targets, we'll do a bunch of work to convert
        // the value into an array before we expand it. Effectively we're trying
        // to accomplish:
        //
        //     (args.length == 1 && Array.try_convert(args[0])) || args
        //
        PUSH_GETLOCAL(ret, location, 1, 0);
        PUSH_INSN(ret, location, dup);
        PUSH_CALL(ret, location, idLength, INT2FIX(0));
        PUSH_INSN1(ret, location, putobject, INT2FIX(1));
        PUSH_CALL(ret, location, idEq, INT2FIX(1));
        PUSH_INSNL(ret, location, branchunless, not_single);
        PUSH_INSN(ret, location, dup);
        PUSH_INSN1(ret, location, putobject, INT2FIX(0));
        PUSH_CALL(ret, location, idAREF, INT2FIX(1));
        PUSH_INSN1(ret, location, putobject, rb_cArray);
        PUSH_INSN(ret, location, swap);
        PUSH_CALL(ret, location, rb_intern("try_convert"), INT2FIX(1));
        PUSH_INSN(ret, location, dup);
        PUSH_INSNL(ret, location, branchunless, not_ary);
        PUSH_INSN(ret, location, swap);
 
        PUSH_LABEL(ret, not_ary);
        PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, not_single);
 
        if (PM_NODE_TYPE_P(node, PM_SPLAT_NODE)) {
            const pm_splat_node_t *cast = (const pm_splat_node_t *) node;
            PUSH_INSN2(ret, location, expandarray, INT2FIX(0), INT2FIX(cast->expression == NULL ? 0 : 1));
        }
 
        PUSH_SEQ(ret, writes);
        PUSH_SEQ(ret, cleanup);
        break;
      }
      default:
        rb_bug("Unexpected node type for index in for node: %s", pm_node_type(PM_NODE_TYPE(node)));
        break;
    }
}
 
static void
pm_compile_rescue(rb_iseq_t *iseq, const pm_begin_node_t *cast, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    LABEL *lstart = NEW_LABEL(node_location->line);
    LABEL *lend = NEW_LABEL(node_location->line);
    LABEL *lcont = NEW_LABEL(node_location->line);
 
    pm_scope_node_t rescue_scope_node;
    pm_scope_node_init((const pm_node_t *) cast->rescue_clause, &rescue_scope_node, scope_node);
 
    rb_iseq_t *rescue_iseq = NEW_CHILD_ISEQ(
        &rescue_scope_node,
        rb_str_concat(rb_str_new2("rescue in "), ISEQ_BODY(iseq)->location.label),
        ISEQ_TYPE_RESCUE,
        pm_node_line_number_cached((const pm_node_t *) cast->rescue_clause, scope_node)
    );
 
    pm_scope_node_destroy(&rescue_scope_node);
 
    lstart->rescued = LABEL_RESCUE_BEG;
    lend->rescued = LABEL_RESCUE_END;
    PUSH_LABEL(ret, lstart);
 
    bool prev_in_rescue = ISEQ_COMPILE_DATA(iseq)->in_rescue;
    ISEQ_COMPILE_DATA(iseq)->in_rescue = true;
 
    if (cast->statements != NULL) {
        PM_COMPILE_NOT_POPPED((const pm_node_t *) cast->statements);
    }
    else {
        const pm_node_location_t location = PM_NODE_START_LOCATION(cast->rescue_clause);
        PUSH_INSN(ret, location, putnil);
    }
 
    ISEQ_COMPILE_DATA(iseq)->in_rescue = prev_in_rescue;
    PUSH_LABEL(ret, lend);
 
    if (cast->else_clause != NULL) {
        if (!popped) PUSH_INSN(ret, *node_location, pop);
        PM_COMPILE((const pm_node_t *) cast->else_clause);
    }
 
    PUSH_INSN(ret, *node_location, nop);
    PUSH_LABEL(ret, lcont);
 
    if (popped) PUSH_INSN(ret, *node_location, pop);
    PUSH_CATCH_ENTRY(CATCH_TYPE_RESCUE, lstart, lend, rescue_iseq, lcont);
    PUSH_CATCH_ENTRY(CATCH_TYPE_RETRY, lend, lcont, NULL, lstart);
}
 
static void
pm_compile_ensure(rb_iseq_t *iseq, const pm_begin_node_t *cast, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_statements_node_t *statements = cast->ensure_clause->statements;
 
    pm_node_location_t location;
    if (statements != NULL) {
        location = PM_NODE_START_LOCATION(statements);
    }
    else {
        location = *node_location;
    }
 
    LABEL *lstart = NEW_LABEL(location.line);
    LABEL *lend = NEW_LABEL(location.line);
    LABEL *lcont = NEW_LABEL(location.line);
 
    struct ensure_range er;
    struct iseq_compile_data_ensure_node_stack enl;
    struct ensure_range *erange;
 
    DECL_ANCHOR(ensr);
    if (statements != NULL) {
        pm_compile_node(iseq, (const pm_node_t *) statements, ensr, true, scope_node);
    }
 
    LINK_ELEMENT *last = ensr->last;
    bool last_leave = last && IS_INSN(last) && IS_INSN_ID(last, leave);
 
    er.begin = lstart;
    er.end = lend;
    er.next = 0;
    push_ensure_entry(iseq, &enl, &er, (void *) cast->ensure_clause);
 
    PUSH_LABEL(ret, lstart);
    if (cast->rescue_clause != NULL) {
        pm_compile_rescue(iseq, cast, node_location, ret, popped | last_leave, scope_node);
    }
    else if (cast->statements != NULL) {
        pm_compile_node(iseq, (const pm_node_t *) cast->statements, ret, popped | last_leave, scope_node);
    }
    else if (!(popped | last_leave)) {
        PUSH_SYNTHETIC_PUTNIL(ret, iseq);
    }
 
    PUSH_LABEL(ret, lend);
    PUSH_SEQ(ret, ensr);
    if (!popped && last_leave) PUSH_INSN(ret, *node_location, putnil);
    PUSH_LABEL(ret, lcont);
    if (last_leave) PUSH_INSN(ret, *node_location, pop);
 
    pm_scope_node_t next_scope_node;
    pm_scope_node_init((const pm_node_t *) cast->ensure_clause, &next_scope_node, scope_node);
 
    rb_iseq_t *child_iseq = NEW_CHILD_ISEQ(
        &next_scope_node,
        rb_str_concat(rb_str_new2("ensure in "), ISEQ_BODY(iseq)->location.label),
        ISEQ_TYPE_ENSURE,
        location.line
    );
 
    pm_scope_node_destroy(&next_scope_node);
 
    erange = ISEQ_COMPILE_DATA(iseq)->ensure_node_stack->erange;
    if (lstart->link.next != &lend->link) {
        while (erange) {
            PUSH_CATCH_ENTRY(CATCH_TYPE_ENSURE, erange->begin, erange->end, child_iseq, lcont);
            erange = erange->next;
        }
    }
    ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = enl.prev;
}
 
static inline bool
pm_opt_str_freeze_p(const rb_iseq_t *iseq, const pm_call_node_t *node)
{
    return (
        !PM_NODE_FLAG_P(node, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION) &&
        node->receiver != NULL &&
        PM_NODE_TYPE_P(node->receiver, PM_STRING_NODE) &&
        node->arguments == NULL &&
        node->block == NULL &&
        ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction
    );
}
 
static void
pm_compile_constant_read(rb_iseq_t *iseq, VALUE name, const pm_location_t *name_loc, uint32_t node_id, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_LOCATION_START_LOCATION(name_loc, node_id);
 
    if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
        ISEQ_BODY(iseq)->ic_size++;
        VALUE segments = rb_ary_new_from_args(1, name);
        RB_OBJ_SET_SHAREABLE(segments);
        PUSH_INSN1(ret, location, opt_getconstant_path, segments);
    }
    else {
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN1(ret, location, putobject, Qtrue);
        PUSH_INSN1(ret, location, getconstant, name);
    }
}
 
static VALUE
pm_constant_path_parts(const pm_node_t *node, const pm_scope_node_t *scope_node)
{
    VALUE parts = rb_ary_new();
 
    while (true) {
        switch (PM_NODE_TYPE(node)) {
          case PM_CONSTANT_READ_NODE: {
            const pm_constant_read_node_t *cast = (const pm_constant_read_node_t *) node;
            VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
            rb_ary_unshift(parts, name);
            return parts;
          }
          case PM_CONSTANT_PATH_NODE: {
            const pm_constant_path_node_t *cast = (const pm_constant_path_node_t *) node;
            VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
            rb_ary_unshift(parts, name);
            if (cast->parent == NULL) {
                rb_ary_unshift(parts, ID2SYM(idNULL));
                return parts;
            }
 
            node = cast->parent;
            break;
          }
          default:
            return Qnil;
        }
    }
}
 
static void
pm_compile_constant_path(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const prefix, LINK_ANCHOR *const body, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
 
    switch (PM_NODE_TYPE(node)) {
      case PM_CONSTANT_READ_NODE: {
        const pm_constant_read_node_t *cast = (const pm_constant_read_node_t *) node;
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
        PUSH_INSN1(body, location, putobject, Qtrue);
        PUSH_INSN1(body, location, getconstant, name);
        break;
      }
      case PM_CONSTANT_PATH_NODE: {
        const pm_constant_path_node_t *cast = (const pm_constant_path_node_t *) node;
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
        if (cast->parent == NULL) {
            PUSH_INSN(body, location, pop);
            PUSH_INSN1(body, location, putobject, rb_cObject);
            PUSH_INSN1(body, location, putobject, Qtrue);
            PUSH_INSN1(body, location, getconstant, name);
        }
        else {
            pm_compile_constant_path(iseq, cast->parent, prefix, body, false, scope_node);
            PUSH_INSN1(body, location, putobject, Qfalse);
            PUSH_INSN1(body, location, getconstant, name);
        }
        break;
      }
      default:
        PM_COMPILE_INTO_ANCHOR(prefix, node);
        break;
    }
}
 
static VALUE
pm_compile_shareable_constant_literal(rb_iseq_t *iseq, const pm_node_t *node, pm_scope_node_t *scope_node)
{
    switch (PM_NODE_TYPE(node)) {
      case PM_TRUE_NODE:
      case PM_FALSE_NODE:
      case PM_NIL_NODE:
      case PM_SYMBOL_NODE:
      case PM_REGULAR_EXPRESSION_NODE:
      case PM_SOURCE_LINE_NODE:
      case PM_INTEGER_NODE:
      case PM_FLOAT_NODE:
      case PM_RATIONAL_NODE:
      case PM_IMAGINARY_NODE:
      case PM_SOURCE_ENCODING_NODE:
        return pm_static_literal_value(iseq, node, scope_node);
      case PM_STRING_NODE:
        return parse_static_literal_string(iseq, scope_node, node, &((const pm_string_node_t *) node)->unescaped);
      case PM_SOURCE_FILE_NODE:
        return pm_source_file_value((const pm_source_file_node_t *) node, scope_node);
      case PM_ARRAY_NODE: {
        const pm_array_node_t *cast = (const pm_array_node_t *) node;
        VALUE result = rb_ary_new_capa(cast->elements.size);
 
        for (size_t index = 0; index < cast->elements.size; index++) {
            VALUE element = pm_compile_shareable_constant_literal(iseq, cast->elements.nodes[index], scope_node);
            if (element == Qundef) return Qundef;
 
            rb_ary_push(result, element);
        }
 
        return rb_ractor_make_shareable(result);
      }
      case PM_HASH_NODE: {
        const pm_hash_node_t *cast = (const pm_hash_node_t *) node;
        VALUE result = rb_hash_alloc_fixed_size(rb_cHash, cast->elements.size);
 
        for (size_t index = 0; index < cast->elements.size; index++) {
            const pm_node_t *element = cast->elements.nodes[index];
            if (!PM_NODE_TYPE_P(element, PM_ASSOC_NODE)) return Qundef;
 
            const pm_assoc_node_t *assoc = (const pm_assoc_node_t *) element;
 
            VALUE key = pm_compile_shareable_constant_literal(iseq, assoc->key, scope_node);
            if (key == Qundef) return Qundef;
 
            VALUE value = pm_compile_shareable_constant_literal(iseq, assoc->value, scope_node);
            if (value == Qundef) return Qundef;
 
            rb_hash_aset(result, key, value);
        }
 
        return rb_ractor_make_shareable(result);
      }
      default:
        return Qundef;
    }
}
 
static void
pm_compile_shareable_constant_value(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_flags_t shareability, VALUE path, LINK_ANCHOR *const ret, pm_scope_node_t *scope_node, bool top)
{
    VALUE literal = pm_compile_shareable_constant_literal(iseq, node, scope_node);
    if (literal != Qundef) {
        const pm_node_location_t location = PM_NODE_START_LOCATION(node);
        PUSH_INSN1(ret, location, putobject, literal);
        return;
    }
 
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    switch (PM_NODE_TYPE(node)) {
      case PM_ARRAY_NODE: {
        const pm_array_node_t *cast = (const pm_array_node_t *) node;
 
        if (top) {
            PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
        }
 
        for (size_t index = 0; index < cast->elements.size; index++) {
            pm_compile_shareable_constant_value(iseq, cast->elements.nodes[index], shareability, path, ret, scope_node, false);
        }
 
        PUSH_INSN1(ret, location, newarray, INT2FIX(cast->elements.size));
 
        if (top) {
            ID method_id = (shareability & PM_SHAREABLE_CONSTANT_NODE_FLAGS_EXPERIMENTAL_COPY) ? rb_intern("make_shareable_copy") : rb_intern("make_shareable");
            PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2FIX(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
        }
 
        return;
      }
      case PM_HASH_NODE: {
        const pm_hash_node_t *cast = (const pm_hash_node_t *) node;
 
        if (top) {
            PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
        }
 
        pm_compile_hash_elements(iseq, (const pm_node_t *) cast, &cast->elements, shareability, path, false, ret, scope_node);
 
        if (top) {
            ID method_id = (shareability & PM_SHAREABLE_CONSTANT_NODE_FLAGS_EXPERIMENTAL_COPY) ? rb_intern("make_shareable_copy") : rb_intern("make_shareable");
            PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2FIX(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
        }
 
        return;
      }
      default: {
        DECL_ANCHOR(value_seq);
 
        pm_compile_node(iseq, node, value_seq, false, scope_node);
        if (PM_NODE_TYPE_P(node, PM_INTERPOLATED_STRING_NODE)) {
            PUSH_SEND_WITH_FLAG(value_seq, location, idUMinus, INT2FIX(0), INT2FIX(VM_CALL_ARGS_SIMPLE));
        }
 
        if (shareability & PM_SHAREABLE_CONSTANT_NODE_FLAGS_LITERAL) {
            PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
            PUSH_SEQ(ret, value_seq);
            if (!RB_OBJ_SHAREABLE_P(path)) {
                RB_OBJ_SET_SHAREABLE(path);
            }
            PUSH_INSN1(ret, location, putobject, path);
            PUSH_SEND_WITH_FLAG(ret, location, rb_intern("ensure_shareable"), INT2FIX(2), INT2FIX(VM_CALL_ARGS_SIMPLE));
        }
        else if (shareability & PM_SHAREABLE_CONSTANT_NODE_FLAGS_EXPERIMENTAL_COPY) {
            if (top) PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
            PUSH_SEQ(ret, value_seq);
            if (top) PUSH_SEND_WITH_FLAG(ret, location, rb_intern("make_shareable_copy"), INT2FIX(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
        }
        else if (shareability & PM_SHAREABLE_CONSTANT_NODE_FLAGS_EXPERIMENTAL_EVERYTHING) {
            if (top) PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
            PUSH_SEQ(ret, value_seq);
            if (top) PUSH_SEND_WITH_FLAG(ret, location, rb_intern("make_shareable"), INT2FIX(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
        }
 
        break;
      }
    }
}
 
static void
pm_compile_constant_write_node(rb_iseq_t *iseq, const pm_constant_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    ID name_id = pm_constant_id_lookup(scope_node, node->name);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, rb_id2str(name_id), ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    if (!popped) PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
 
    VALUE operand = ID2SYM(name_id);
    PUSH_INSN1(ret, location, setconstant, operand);
}
 
static void
pm_compile_constant_and_write_node(rb_iseq_t *iseq, const pm_constant_and_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
 
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, node->name));
    LABEL *end_label = NEW_LABEL(location.line);
 
    pm_compile_constant_read(iseq, name, &node->name_loc, location.node_id, ret, scope_node);
    if (!popped) PUSH_INSN(ret, location, dup);
 
    PUSH_INSNL(ret, location, branchunless, end_label);
    if (!popped) PUSH_INSN(ret, location, pop);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, name, ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    if (!popped) PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
    PUSH_INSN1(ret, location, setconstant, name);
    PUSH_LABEL(ret, end_label);
}
 
static void
pm_compile_constant_or_write_node(rb_iseq_t *iseq, const pm_constant_or_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, node->name));
 
    LABEL *set_label = NEW_LABEL(location.line);
    LABEL *end_label = NEW_LABEL(location.line);
 
    PUSH_INSN(ret, location, putnil);
    PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_CONST), name, Qtrue);
    PUSH_INSNL(ret, location, branchunless, set_label);
 
    pm_compile_constant_read(iseq, name, &node->name_loc, location.node_id, ret, scope_node);
    if (!popped) PUSH_INSN(ret, location, dup);
 
    PUSH_INSNL(ret, location, branchif, end_label);
    if (!popped) PUSH_INSN(ret, location, pop);
    PUSH_LABEL(ret, set_label);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, name, ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    if (!popped) PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
    PUSH_INSN1(ret, location, setconstant, name);
    PUSH_LABEL(ret, end_label);
}
 
static void
pm_compile_constant_operator_write_node(rb_iseq_t *iseq, const pm_constant_operator_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
 
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, node->name));
    ID method_id = pm_constant_id_lookup(scope_node, node->binary_operator);
 
    pm_compile_constant_read(iseq, name, &node->name_loc, location.node_id, ret, scope_node);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, name, ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2NUM(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
    if (!popped) PUSH_INSN(ret, location, dup);
 
    PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
    PUSH_INSN1(ret, location, setconstant, name);
}
 
static VALUE
pm_constant_path_path(const pm_constant_path_node_t *node, const pm_scope_node_t *scope_node)
{
    VALUE parts = rb_ary_new();
    rb_ary_push(parts, rb_id2str(pm_constant_id_lookup(scope_node, node->name)));
 
    const pm_node_t *current = node->parent;
    while (current != NULL && PM_NODE_TYPE_P(current, PM_CONSTANT_PATH_NODE)) {
        const pm_constant_path_node_t *cast = (const pm_constant_path_node_t *) current;
        rb_ary_unshift(parts, rb_id2str(pm_constant_id_lookup(scope_node, cast->name)));
        current = cast->parent;
    }
 
    if (current == NULL) {
        rb_ary_unshift(parts, rb_id2str(idNULL));
    }
    else if (PM_NODE_TYPE_P(current, PM_CONSTANT_READ_NODE)) {
        rb_ary_unshift(parts, rb_id2str(pm_constant_id_lookup(scope_node, ((const pm_constant_read_node_t *) current)->name)));
    }
    else {
        rb_ary_unshift(parts, rb_str_new_cstr("..."));
    }
 
    return rb_ary_join(parts, rb_str_new_cstr("::"));
}
 
static void
pm_compile_constant_path_write_node(rb_iseq_t *iseq, const pm_constant_path_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    const pm_constant_path_node_t *target = node->target;
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, target->name));
 
    if (target->parent) {
        PM_COMPILE_NOT_POPPED((const pm_node_t *) target->parent);
    }
    else {
        PUSH_INSN1(ret, location, putobject, rb_cObject);
    }
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, pm_constant_path_path(node->target, scope_node), ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    if (!popped) {
        PUSH_INSN(ret, location, swap);
        PUSH_INSN1(ret, location, topn, INT2FIX(1));
    }
 
    PUSH_INSN(ret, location, swap);
    PUSH_INSN1(ret, location, setconstant, name);
}
 
static void
pm_compile_constant_path_and_write_node(rb_iseq_t *iseq, const pm_constant_path_and_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    const pm_constant_path_node_t *target = node->target;
 
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, target->name));
    LABEL *lfin = NEW_LABEL(location.line);
 
    if (target->parent) {
        PM_COMPILE_NOT_POPPED(target->parent);
    }
    else {
        PUSH_INSN1(ret, location, putobject, rb_cObject);
    }
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, putobject, Qtrue);
    PUSH_INSN1(ret, location, getconstant, name);
 
    if (!popped) PUSH_INSN(ret, location, dup);
    PUSH_INSNL(ret, location, branchunless, lfin);
 
    if (!popped) PUSH_INSN(ret, location, pop);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, pm_constant_path_path(node->target, scope_node), ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    if (popped) {
        PUSH_INSN1(ret, location, topn, INT2FIX(1));
    }
    else {
        PUSH_INSN1(ret, location, dupn, INT2FIX(2));
        PUSH_INSN(ret, location, swap);
    }
 
    PUSH_INSN1(ret, location, setconstant, name);
    PUSH_LABEL(ret, lfin);
 
    if (!popped) PUSH_INSN(ret, location, swap);
    PUSH_INSN(ret, location, pop);
}
 
static void
pm_compile_constant_path_or_write_node(rb_iseq_t *iseq, const pm_constant_path_or_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    const pm_constant_path_node_t *target = node->target;
 
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, target->name));
    LABEL *lassign = NEW_LABEL(location.line);
    LABEL *lfin = NEW_LABEL(location.line);
 
    if (target->parent) {
        PM_COMPILE_NOT_POPPED(target->parent);
    }
    else {
        PUSH_INSN1(ret, location, putobject, rb_cObject);
    }
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_CONST_FROM), name, Qtrue);
    PUSH_INSNL(ret, location, branchunless, lassign);
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, putobject, Qtrue);
    PUSH_INSN1(ret, location, getconstant, name);
 
    if (!popped) PUSH_INSN(ret, location, dup);
    PUSH_INSNL(ret, location, branchif, lfin);
 
    if (!popped) PUSH_INSN(ret, location, pop);
    PUSH_LABEL(ret, lassign);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, pm_constant_path_path(node->target, scope_node), ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    if (popped) {
        PUSH_INSN1(ret, location, topn, INT2FIX(1));
    }
    else {
        PUSH_INSN1(ret, location, dupn, INT2FIX(2));
        PUSH_INSN(ret, location, swap);
    }
 
    PUSH_INSN1(ret, location, setconstant, name);
    PUSH_LABEL(ret, lfin);
 
    if (!popped) PUSH_INSN(ret, location, swap);
    PUSH_INSN(ret, location, pop);
}
 
static void
pm_compile_constant_path_operator_write_node(rb_iseq_t *iseq, const pm_constant_path_operator_write_node_t *node, const pm_node_flags_t shareability, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    const pm_constant_path_node_t *target = node->target;
 
    ID method_id = pm_constant_id_lookup(scope_node, node->binary_operator);
    VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, target->name));
 
    if (target->parent) {
        PM_COMPILE_NOT_POPPED(target->parent);
    }
    else {
        PUSH_INSN1(ret, location, putobject, rb_cObject);
    }
 
    PUSH_INSN(ret, location, dup);
    PUSH_INSN1(ret, location, putobject, Qtrue);
    PUSH_INSN1(ret, location, getconstant, name);
 
    if (shareability != 0) {
        pm_compile_shareable_constant_value(iseq, node->value, shareability, pm_constant_path_path(node->target, scope_node), ret, scope_node, true);
    }
    else {
        PM_COMPILE_NOT_POPPED(node->value);
    }
 
    PUSH_CALL(ret, location, method_id, INT2FIX(1));
    PUSH_INSN(ret, location, swap);
 
    if (!popped) {
        PUSH_INSN1(ret, location, topn, INT2FIX(1));
        PUSH_INSN(ret, location, swap);
    }
 
    PUSH_INSN1(ret, location, setconstant, name);
}
 
#define PM_CONTAINER_P(node) (PM_NODE_TYPE_P(node, PM_ARRAY_NODE) || PM_NODE_TYPE_P(node, PM_HASH_NODE) || PM_NODE_TYPE_P(node, PM_RANGE_NODE))
 
static inline void
pm_compile_scope_node(rb_iseq_t *iseq, pm_scope_node_t *scope_node, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped)
{
    const pm_node_location_t location = *node_location;
    struct rb_iseq_constant_body *body = ISEQ_BODY(iseq);
 
    pm_constant_id_list_t *locals = &scope_node->locals;
    pm_parameters_node_t *parameters_node = NULL;
    pm_node_list_t *keywords_list = NULL;
    pm_node_list_t *optionals_list = NULL;
    pm_node_list_t *posts_list = NULL;
    pm_node_list_t *requireds_list = NULL;
    pm_node_list_t *block_locals = NULL;
    bool trailing_comma = false;
 
    if (PM_NODE_TYPE_P(scope_node->ast_node, PM_CLASS_NODE) || PM_NODE_TYPE_P(scope_node->ast_node, PM_MODULE_NODE)) {
        PUSH_TRACE(ret, RUBY_EVENT_CLASS);
    }
 
    if (scope_node->parameters != NULL) {
        switch (PM_NODE_TYPE(scope_node->parameters)) {
          case PM_BLOCK_PARAMETERS_NODE: {
            pm_block_parameters_node_t *cast = (pm_block_parameters_node_t *) scope_node->parameters;
            parameters_node = cast->parameters;
            block_locals = &cast->locals;
 
            if (parameters_node) {
                if (parameters_node->rest && PM_NODE_TYPE_P(parameters_node->rest, PM_IMPLICIT_REST_NODE)) {
                    trailing_comma = true;
                }
            }
            break;
          }
          case PM_PARAMETERS_NODE: {
            parameters_node = (pm_parameters_node_t *) scope_node->parameters;
            break;
          }
          case PM_NUMBERED_PARAMETERS_NODE: {
            uint32_t maximum = ((const pm_numbered_parameters_node_t *) scope_node->parameters)->maximum;
            body->param.lead_num = maximum;
            body->param.flags.ambiguous_param0 = maximum == 1;
            break;
          }
          case PM_IT_PARAMETERS_NODE:
            body->param.lead_num = 1;
            body->param.flags.ambiguous_param0 = true;
            break;
          default:
            rb_bug("Unexpected node type for parameters: %s", pm_node_type(PM_NODE_TYPE(scope_node->parameters)));
        }
    }
 
    struct rb_iseq_param_keyword *keyword = NULL;
 
    if (parameters_node) {
        optionals_list = &parameters_node->optionals;
        requireds_list = &parameters_node->requireds;
        keywords_list = &parameters_node->keywords;
        posts_list = &parameters_node->posts;
    }
    else if (scope_node->parameters && (PM_NODE_TYPE_P(scope_node->parameters, PM_NUMBERED_PARAMETERS_NODE) || PM_NODE_TYPE_P(scope_node->parameters, PM_IT_PARAMETERS_NODE))) {
        body->param.opt_num = 0;
    }
    else {
        body->param.lead_num = 0;
        body->param.opt_num = 0;
    }
 
    //********STEP 1**********
    // Goal: calculate the table size for the locals, accounting for
    // hidden variables and multi target nodes
    size_t locals_size = locals->size;
 
    // Index lookup table buffer size is only the number of the locals.
    // We'll initialize it after computing table_size below.
    pm_index_lookup_table_t index_lookup_table = PM_INDEX_LOOKUP_TABLE_INIT;
 
    int table_size = (int) locals_size;
 
    // For nodes have a hidden iteration variable. We add that to the local
    // table size here.
    if (PM_NODE_TYPE_P(scope_node->ast_node, PM_FOR_NODE)) table_size++;
 
    if (keywords_list && keywords_list->size) {
        table_size++;
    }
 
    if (requireds_list) {
        for (size_t i = 0; i < requireds_list->size; i++) {
            // For each MultiTargetNode, we're going to have one
            // additional anonymous local not represented in the locals table
            // We want to account for this in our table size
            pm_node_t *required = requireds_list->nodes[i];
            if (PM_NODE_TYPE_P(required, PM_MULTI_TARGET_NODE)) {
                table_size++;
            }
            else if (PM_NODE_TYPE_P(required, PM_REQUIRED_PARAMETER_NODE)) {
                if (PM_NODE_FLAG_P(required, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    table_size++;
                }
            }
        }
    }
 
    // If we have the `it` implicit local variable, we need to account for
    // it in the local table size.
    if (scope_node->parameters != NULL && PM_NODE_TYPE_P(scope_node->parameters, PM_IT_PARAMETERS_NODE)) {
        table_size++;
    }
 
    // Ensure there is enough room in the local table for any
    // parameters that have been repeated
    // ex: def underscore_parameters(_, _ = 1, _ = 2); _; end
    //                                  ^^^^^^^^^^^^
    if (optionals_list && optionals_list->size) {
        for (size_t i = 0; i < optionals_list->size; i++) {
            pm_node_t * node = optionals_list->nodes[i];
            if (PM_NODE_FLAG_P(node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                table_size++;
            }
        }
    }
 
    // If we have an anonymous "rest" node, we'll need to increase the local
    // table size to take it in to account.
    // def m(foo, *, bar)
    //            ^
    if (parameters_node) {
        if (parameters_node->rest) {
            if (!(PM_NODE_TYPE_P(parameters_node->rest, PM_IMPLICIT_REST_NODE))) {
                if (!((const pm_rest_parameter_node_t *) parameters_node->rest)->name || PM_NODE_FLAG_P(parameters_node->rest, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    table_size++;
                }
            }
        }
 
        // def foo(_, **_); _; end
        //            ^^^
        if (parameters_node->keyword_rest) {
            // def foo(...); end
            //         ^^^
            // When we have a `...` as the keyword_rest, it's a forwarding_parameter_node and
            // we need to leave space for 4 locals: *, **, &, ...
            if (PM_NODE_TYPE_P(parameters_node->keyword_rest, PM_FORWARDING_PARAMETER_NODE)) {
                // Only optimize specifically methods like this: `foo(...)`
                if (requireds_list->size == 0 && optionals_list->size == 0 && keywords_list->size == 0) {
                    ISEQ_BODY(iseq)->param.flags.use_block = TRUE;
                    ISEQ_BODY(iseq)->param.flags.forwardable = TRUE;
                    table_size += 1;
                }
                else {
                    table_size += 4;
                }
            }
            else {
                const pm_keyword_rest_parameter_node_t *kw_rest = (const pm_keyword_rest_parameter_node_t *) parameters_node->keyword_rest;
 
                // If it's anonymous or repeated, then we need to allocate stack space
                if (!kw_rest->name || PM_NODE_FLAG_P(kw_rest, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    table_size++;
                }
            }
        }
    }
 
    if (posts_list) {
        for (size_t i = 0; i < posts_list->size; i++) {
            // For each MultiTargetNode, we're going to have one
            // additional anonymous local not represented in the locals table
            // We want to account for this in our table size
            pm_node_t *required = posts_list->nodes[i];
            if (PM_NODE_TYPE_P(required, PM_MULTI_TARGET_NODE) || PM_NODE_FLAG_P(required, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                table_size++;
            }
        }
    }
 
    if (keywords_list && keywords_list->size) {
        for (size_t i = 0; i < keywords_list->size; i++) {
            pm_node_t *keyword_parameter_node = keywords_list->nodes[i];
            if (PM_NODE_FLAG_P(keyword_parameter_node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                table_size++;
            }
        }
    }
 
    if (parameters_node && parameters_node->block && PM_NODE_TYPE_P(parameters_node->block, PM_BLOCK_PARAMETER_NODE)) {
        const pm_block_parameter_node_t *block_node = (const pm_block_parameter_node_t *) parameters_node->block;
 
        if (PM_NODE_FLAG_P(block_node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER) || !block_node->name) {
            table_size++;
        }
    }
 
    // We can create local_table_for_iseq with the correct size
    VALUE idtmp = 0;
    rb_ast_id_table_t *local_table_for_iseq = ALLOCV(idtmp, sizeof(rb_ast_id_table_t) + table_size * sizeof(ID));
    local_table_for_iseq->size = table_size;
 
    // Init the direct-indexed lookup table. The capacity is based on the
    // parser's constant pool size (for regular locals) plus special slots.
    pm_index_lookup_table_init(&index_lookup_table, (int) pm_parser_constants_size(scope_node->parser), iseq);
 
    //********END OF STEP 1**********
 
    //********STEP 2**********
    // Goal: populate iv index table as well as local table, keeping the
    // layout of the local table consistent with the layout of the
    // stack when calling the method
    //
    // Do a first pass on all of the parameters, setting their values in
    // the local_table_for_iseq, _except_ for Multis who get a hidden
    // variable in this step, and will get their names inserted in step 3
 
    // local_index is a cursor that keeps track of the current
    // index into local_table_for_iseq. The local table is actually a list,
    // and the order of that list must match the order of the items pushed
    // on the stack.  We need to take in to account things pushed on the
    // stack that _might not have a name_ (for example array destructuring).
    // This index helps us know which item we're dealing with and also give
    // those anonymous items temporary names (as below)
    int local_index = 0;
 
    // Here we figure out local table indices and insert them in to the
    // index lookup table and local tables.
    //
    // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
    //         ^^^^^^^^^^^^^
    if (requireds_list && requireds_list->size) {
        for (size_t i = 0; i < requireds_list->size; i++, local_index++) {
            ID local;
 
            // For each MultiTargetNode, we're going to have one additional
            // anonymous local not represented in the locals table. We want
            // to account for this in our table size.
            pm_node_t *required = requireds_list->nodes[i];
 
            switch (PM_NODE_TYPE(required)) {
              case PM_MULTI_TARGET_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //            ^^^^^^^^^^
                local = rb_make_temporary_id(local_index);
                local_table_for_iseq->ids[local_index] = local;
                break;
              }
              case PM_REQUIRED_PARAMETER_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //         ^
                const pm_required_parameter_node_t *param = (const pm_required_parameter_node_t *) required;
 
                if (PM_NODE_FLAG_P(required, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    ID local = pm_constant_id_lookup(scope_node, param->name);
                    local_table_for_iseq->ids[local_index] = local;
                }
                else {
                    pm_insert_local_index(param->name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                }
 
                break;
              }
              default:
                rb_bug("Unsupported node in requireds in parameters %s", pm_node_type(PM_NODE_TYPE(required)));
            }
        }
 
        body->param.lead_num = (int) requireds_list->size;
        body->param.flags.has_lead = true;
    }
 
    if (scope_node->parameters != NULL && PM_NODE_TYPE_P(scope_node->parameters, PM_IT_PARAMETERS_NODE)) {
        local_table_for_iseq->ids[local_index++] = idItImplicit;
    }
 
    // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
    //                        ^^^^^
    if (optionals_list && optionals_list->size) {
        body->param.opt_num = (int) optionals_list->size;
        body->param.flags.has_opt = true;
 
        for (size_t i = 0; i < optionals_list->size; i++, local_index++) {
            pm_node_t * node = optionals_list->nodes[i];
            pm_constant_id_t name = ((const pm_optional_parameter_node_t *) node)->name;
 
            if (PM_NODE_FLAG_P(node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                ID local = pm_constant_id_lookup(scope_node, name);
                local_table_for_iseq->ids[local_index] = local;
            }
            else {
                pm_insert_local_index(name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
            }
        }
    }
 
    // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
    //                               ^^
    if (parameters_node && parameters_node->rest) {
        body->param.rest_start = local_index;
 
        // If there's a trailing comma, we'll have an implicit rest node,
        // and we don't want it to impact the rest variables on param
        if (!(PM_NODE_TYPE_P(parameters_node->rest, PM_IMPLICIT_REST_NODE))) {
            body->param.flags.has_rest = true;
            RUBY_ASSERT(body->param.rest_start != -1);
 
            pm_constant_id_t name = ((const pm_rest_parameter_node_t *) parameters_node->rest)->name;
 
            if (name) {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //                               ^^
                if (PM_NODE_FLAG_P(parameters_node->rest, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    ID local = pm_constant_id_lookup(scope_node, name);
                    local_table_for_iseq->ids[local_index] = local;
                }
                else {
                    pm_insert_local_index(name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                }
            }
            else {
                // def foo(a, (b, *c, d), e = 1, *, g, (h, *i, j), k:, l: 1, **m, &n)
                //                               ^
                body->param.flags.anon_rest = true;
                pm_insert_local_special(PM_CONSTANT_MULT, idMULT, local_index, &index_lookup_table, local_table_for_iseq);
            }
 
            local_index++;
        }
    }
 
    // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
    //                                   ^^^^^^^^^^^^^
    if (posts_list && posts_list->size) {
        body->param.post_num = (int) posts_list->size;
        body->param.post_start = local_index;
        body->param.flags.has_post = true;
 
        for (size_t i = 0; i < posts_list->size; i++, local_index++) {
            ID local;
 
            // For each MultiTargetNode, we're going to have one additional
            // anonymous local not represented in the locals table. We want
            // to account for this in our table size.
            const pm_node_t *post_node = posts_list->nodes[i];
 
            switch (PM_NODE_TYPE(post_node)) {
              case PM_MULTI_TARGET_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //                                      ^^^^^^^^^^
                local = rb_make_temporary_id(local_index);
                local_table_for_iseq->ids[local_index] = local;
                break;
              }
              case PM_REQUIRED_PARAMETER_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //                                   ^
                const pm_required_parameter_node_t *param = (const pm_required_parameter_node_t *) post_node;
 
                if (PM_NODE_FLAG_P(param, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    ID local = pm_constant_id_lookup(scope_node, param->name);
                    local_table_for_iseq->ids[local_index] = local;
                }
                else {
                    pm_insert_local_index(param->name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                }
                break;
              }
              default:
                rb_bug("Unsupported node in posts in parameters %s", pm_node_type(PM_NODE_TYPE(post_node)));
            }
        }
    }
 
    // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
    //                                                   ^^^^^^^^
    // Keywords create an internal variable on the parse tree
    if (keywords_list && keywords_list->size) {
        if (keywords_list->size > VM_CALL_KW_LEN_MAX) {
            COMPILE_ERROR(iseq, node_location->line, "too many keyword parameters (%d, maximum is %d)",
                          (int) keywords_list->size, (int) VM_CALL_KW_LEN_MAX);
        }
 
        keyword = ZALLOC_N(struct rb_iseq_param_keyword, 1);
        keyword->num = (int) keywords_list->size;
 
        const VALUE default_values = rb_ary_hidden_new(1);
        const VALUE complex_mark = rb_str_tmp_new(0);
 
        for (size_t i = 0; i < keywords_list->size; i++) {
            pm_node_t *keyword_parameter_node = keywords_list->nodes[i];
            pm_constant_id_t name;
 
            // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
            //                                                   ^^
            if (PM_NODE_TYPE_P(keyword_parameter_node, PM_REQUIRED_KEYWORD_PARAMETER_NODE)) {
                name = ((const pm_required_keyword_parameter_node_t *) keyword_parameter_node)->name;
                keyword->required_num++;
                ID local = pm_constant_id_lookup(scope_node, name);
 
                if (PM_NODE_FLAG_P(keyword_parameter_node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    local_table_for_iseq->ids[local_index] = local;
                }
                else {
                    pm_insert_local_index(name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                }
                local_index++;
            }
        }
 
        for (size_t i = 0; i < keywords_list->size; i++) {
            pm_node_t *keyword_parameter_node = keywords_list->nodes[i];
            pm_constant_id_t name;
 
            // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
            //                                                       ^^^^
            if (PM_NODE_TYPE_P(keyword_parameter_node, PM_OPTIONAL_KEYWORD_PARAMETER_NODE)) {
                const pm_optional_keyword_parameter_node_t *cast = ((const pm_optional_keyword_parameter_node_t *) keyword_parameter_node);
 
                pm_node_t *value = cast->value;
                name = cast->name;
 
                if (PM_NODE_FLAG_P(value, PM_NODE_FLAG_STATIC_LITERAL) && !PM_CONTAINER_P(value)) {
                    rb_ary_push(default_values, pm_static_literal_value(iseq, value, scope_node));
                }
                else {
                    rb_ary_push(default_values, complex_mark);
                }
 
                ID local = pm_constant_id_lookup(scope_node, name);
                if (PM_NODE_FLAG_P(keyword_parameter_node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                    local_table_for_iseq->ids[local_index] = local;
                }
                else {
                    pm_insert_local_index(name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                }
                local_index++;
            }
 
        }
 
        if (RARRAY_LEN(default_values)) {
            VALUE *dvs = ALLOC_N(VALUE, RARRAY_LEN(default_values));
 
            for (int i = 0; i < RARRAY_LEN(default_values); i++) {
                VALUE dv = RARRAY_AREF(default_values, i);
                if (dv == complex_mark) dv = Qundef;
                RB_OBJ_WRITE(iseq, &dvs[i], dv);
            }
 
            keyword->default_values = dvs;
        }
 
        // Hidden local for keyword arguments
        keyword->bits_start = local_index;
        ID local = rb_make_temporary_id(local_index);
        local_table_for_iseq->ids[local_index] = local;
        local_index++;
 
        body->param.keyword = keyword;
        body->param.flags.has_kw = true;
    }
 
    if (body->type == ISEQ_TYPE_BLOCK && local_index == 1 && requireds_list && requireds_list->size == 1 && !trailing_comma) {
        body->param.flags.ambiguous_param0 = true;
    }
 
    if (parameters_node) {
        // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
        //                                                             ^^^
        if (parameters_node->keyword_rest) {
            switch (PM_NODE_TYPE(parameters_node->keyword_rest)) {
              case PM_NO_KEYWORDS_PARAMETER_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **nil, &n)
                //                                                             ^^^^^
                body->param.flags.accepts_no_kwarg = true;
                break;
              }
              case PM_KEYWORD_REST_PARAMETER_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //                                                             ^^^
                const pm_keyword_rest_parameter_node_t *kw_rest_node = (const pm_keyword_rest_parameter_node_t *) parameters_node->keyword_rest;
                if (!body->param.flags.has_kw) {
                    body->param.keyword = keyword = ZALLOC_N(struct rb_iseq_param_keyword, 1);
                }
 
                keyword->rest_start = local_index;
                body->param.flags.has_kwrest = true;
 
                pm_constant_id_t constant_id = kw_rest_node->name;
                if (constant_id) {
                    if (PM_NODE_FLAG_P(kw_rest_node, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                        ID local = pm_constant_id_lookup(scope_node, constant_id);
                        local_table_for_iseq->ids[local_index] = local;
                    }
                    else {
                        pm_insert_local_index(constant_id, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                    }
                }
                else {
                    body->param.flags.anon_kwrest = true;
                    pm_insert_local_special(PM_CONSTANT_POW, idPow, local_index, &index_lookup_table, local_table_for_iseq);
                }
 
                local_index++;
                break;
              }
              case PM_FORWARDING_PARAMETER_NODE: {
                // def foo(...)
                //         ^^^
                if (!ISEQ_BODY(iseq)->param.flags.forwardable) {
                    // Add the anonymous *
                    body->param.rest_start = local_index;
                    body->param.flags.has_rest = true;
                    body->param.flags.anon_rest = true;
                    pm_insert_local_special(PM_CONSTANT_MULT, idMULT, local_index++, &index_lookup_table, local_table_for_iseq);
 
                    // Add the anonymous **
                    RUBY_ASSERT(!body->param.flags.has_kw);
                    body->param.flags.has_kw = false;
                    body->param.flags.has_kwrest = true;
                    body->param.flags.anon_kwrest = true;
                    body->param.keyword = keyword = ZALLOC_N(struct rb_iseq_param_keyword, 1);
                    keyword->rest_start = local_index;
                    pm_insert_local_special(PM_CONSTANT_POW, idPow, local_index++, &index_lookup_table, local_table_for_iseq);
 
                    // Add the anonymous &
                    body->param.block_start = local_index;
                    body->param.flags.has_block = true;
                    pm_insert_local_special(PM_CONSTANT_AND, idAnd, local_index++, &index_lookup_table, local_table_for_iseq);
                }
 
                // Add the ...
                pm_insert_local_special(PM_CONSTANT_DOT3, idDot3, local_index++, &index_lookup_table, local_table_for_iseq);
                break;
              }
              default:
                rb_bug("node type %s not expected as keyword_rest", pm_node_type(PM_NODE_TYPE(parameters_node->keyword_rest)));
            }
        }
 
        // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
        //                                                                  ^^
        if (parameters_node->block) {
            switch (PM_NODE_TYPE(parameters_node->block)) {
              case PM_BLOCK_PARAMETER_NODE: {
                body->param.block_start = local_index;
                body->param.flags.has_block = true;
 
                iseq_set_use_block(iseq);
 
                pm_constant_id_t name = ((const pm_block_parameter_node_t *) parameters_node->block)->name;
 
                if (name) {
                    if (PM_NODE_FLAG_P(parameters_node->block, PM_PARAMETER_FLAGS_REPEATED_PARAMETER)) {
                        ID local = pm_constant_id_lookup(scope_node, name);
                        local_table_for_iseq->ids[local_index] = local;
                    }
                    else {
                        pm_insert_local_index(name, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
                    }
                }
                else {
                    pm_insert_local_special(PM_CONSTANT_AND, idAnd, local_index, &index_lookup_table, local_table_for_iseq);
                }
 
                local_index++;
                break;
              }
              case PM_NO_BLOCK_PARAMETER_NODE: {
                body->param.flags.accepts_no_block = true;
                break;
              }
              default:
                rb_bug("node type %s not expected as block parameter", pm_node_type(PM_NODE_TYPE(parameters_node->block)));
            }
        }
    }
 
    //********END OF STEP 2**********
    // The local table is now consistent with expected
    // stack layout
 
    // If there's only one required element in the parameters
    // CRuby needs to recognize it as an ambiguous parameter
 
    //********STEP 3**********
    // Goal: fill in the names of the parameters in MultiTargetNodes
    //
    // Go through requireds again to set the multis
 
    if (requireds_list && requireds_list->size) {
        for (size_t i = 0; i < requireds_list->size; i++) {
            // For each MultiTargetNode, we're going to have one
            // additional anonymous local not represented in the locals table
            // We want to account for this in our table size
            const pm_node_t *required = requireds_list->nodes[i];
 
            if (PM_NODE_TYPE_P(required, PM_MULTI_TARGET_NODE)) {
                local_index = pm_compile_destructured_param_locals((const pm_multi_target_node_t *) required, &index_lookup_table, local_table_for_iseq, scope_node, local_index);
            }
        }
    }
 
    // Go through posts again to set the multis
    if (posts_list && posts_list->size) {
        for (size_t i = 0; i < posts_list->size; i++) {
            // For each MultiTargetNode, we're going to have one
            // additional anonymous local not represented in the locals table
            // We want to account for this in our table size
            const pm_node_t *post = posts_list->nodes[i];
 
            if (PM_NODE_TYPE_P(post, PM_MULTI_TARGET_NODE)) {
                local_index = pm_compile_destructured_param_locals((const pm_multi_target_node_t *) post, &index_lookup_table, local_table_for_iseq, scope_node, local_index);
            }
        }
    }
 
    // Set any anonymous locals for the for node
    if (PM_NODE_TYPE_P(scope_node->ast_node, PM_FOR_NODE)) {
        if (PM_NODE_TYPE_P(((const pm_for_node_t *) scope_node->ast_node)->index, PM_LOCAL_VARIABLE_TARGET_NODE)) {
            body->param.lead_num++;
        }
        else {
            body->param.rest_start = local_index;
            body->param.flags.has_rest = true;
        }
 
        ID local = rb_make_temporary_id(local_index);
        local_table_for_iseq->ids[local_index] = local;
        local_index++;
    }
 
    // Fill in any NumberedParameters, if they exist
    if (scope_node->parameters && PM_NODE_TYPE_P(scope_node->parameters, PM_NUMBERED_PARAMETERS_NODE)) {
        int maximum = ((const pm_numbered_parameters_node_t *) scope_node->parameters)->maximum;
        RUBY_ASSERT(0 < maximum && maximum <= 9);
        for (int i = 0; i < maximum; i++, local_index++) {
            const uint8_t param_name[] = { '_', '1' + i };
            pm_constant_id_t constant_id = pm_parser_constant_find(scope_node->parser, param_name, 2);
            RUBY_ASSERT(constant_id && "parser should fill in any gaps in numbered parameters");
            pm_insert_local_index(constant_id, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
        }
        body->param.lead_num = maximum;
        body->param.flags.has_lead = true;
    }
 
    // Fill in the anonymous `it` parameter, if it exists
    if (scope_node->parameters && PM_NODE_TYPE_P(scope_node->parameters, PM_IT_PARAMETERS_NODE)) {
        body->param.lead_num = 1;
        body->param.flags.has_lead = true;
    }
 
    //********END OF STEP 3**********
 
    //********STEP 4**********
    // Goal: fill in the method body locals
    // To be explicit, these are the non-parameter locals
    // We fill in the block_locals, if they exist
    // lambda { |x; y| y }
    //              ^
    if (block_locals && block_locals->size) {
        for (size_t i = 0; i < block_locals->size; i++, local_index++) {
            pm_constant_id_t constant_id = ((const pm_block_local_variable_node_t *) block_locals->nodes[i])->name;
            pm_insert_local_index(constant_id, local_index, &index_lookup_table, local_table_for_iseq, scope_node);
        }
    }
 
    // Fill in any locals we missed
    if (scope_node->locals.size) {
        for (size_t i = 0; i < scope_node->locals.size; i++) {
            pm_constant_id_t constant_id = locals->ids[i];
            if (constant_id) {
                int existing;
                if (!pm_index_lookup_table_lookup(&index_lookup_table, constant_id, &existing)) {
                    ID local = pm_constant_id_lookup(scope_node, constant_id);
                    local_table_for_iseq->ids[local_index] = local;
                    pm_index_lookup_table_insert(&index_lookup_table, constant_id, local_index);
                    local_index++;
                }
            }
        }
    }
 
    //********END OF STEP 4**********
 
    // We set the index_lookup_table on the scope node so we can
    // refer to the parameters correctly.
    scope_node->index_lookup_table = index_lookup_table;
    iseq_calc_param_size(iseq);
 
    if (ISEQ_BODY(iseq)->param.flags.forwardable) {
        // We're treating `...` as a parameter so that frame
        // pushing won't clobber it.
        ISEQ_BODY(iseq)->param.size += 1;
    }
 
    // FIXME: args?
    iseq_set_local_table(iseq, local_table_for_iseq, 0);
    iseq_set_parameters_lvar_state(iseq);
 
    scope_node->local_table_for_iseq_size = local_table_for_iseq->size;
 
    if (keyword != NULL) {
        size_t keyword_start_index = keyword->bits_start - keyword->num;
        keyword->table = (ID *)&ISEQ_BODY(iseq)->local_table[keyword_start_index];
    }
 
    //********STEP 5************
    // Goal: compile anything that needed to be compiled
    if (optionals_list && optionals_list->size) {
        LABEL **opt_table = (LABEL **) ALLOC_N(VALUE, optionals_list->size + 1);
        LABEL *label;
 
        // TODO: Should we make an api for NEW_LABEL where you can pass
        // a pointer to the label it should fill out?  We already
        // have a list of labels allocated above so it seems wasteful
        // to do the copies.
        for (size_t i = 0; i < optionals_list->size; i++) {
            label = NEW_LABEL(location.line);
            opt_table[i] = label;
            PUSH_LABEL(ret, label);
            pm_node_t *optional_node = optionals_list->nodes[i];
            PM_COMPILE_NOT_POPPED(optional_node);
        }
 
        // Set the last label
        label = NEW_LABEL(location.line);
        opt_table[optionals_list->size] = label;
        PUSH_LABEL(ret, label);
 
        body->param.opt_table = (const VALUE *) opt_table;
    }
 
    if (keywords_list && keywords_list->size) {
        size_t optional_index = 0;
        for (size_t i = 0; i < keywords_list->size; i++) {
            pm_node_t *keyword_parameter_node = keywords_list->nodes[i];
            pm_constant_id_t name;
 
            switch (PM_NODE_TYPE(keyword_parameter_node)) {
              case PM_OPTIONAL_KEYWORD_PARAMETER_NODE: {
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //                                                       ^^^^
                const pm_optional_keyword_parameter_node_t *cast = ((const pm_optional_keyword_parameter_node_t *) keyword_parameter_node);
 
                pm_node_t *value = cast->value;
                name = cast->name;
 
                if (!PM_NODE_FLAG_P(value, PM_NODE_FLAG_STATIC_LITERAL) || PM_CONTAINER_P(value)) {
                    LABEL *end_label = NEW_LABEL(location.line);
 
                    pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, name, 0);
                    int kw_bits_idx = table_size - body->param.keyword->bits_start;
                    PUSH_INSN2(ret, location, checkkeyword, INT2FIX(kw_bits_idx + VM_ENV_DATA_SIZE - 1), INT2FIX(optional_index));
                    PUSH_INSNL(ret, location, branchif, end_label);
                    PM_COMPILE(value);
                    PUSH_SETLOCAL(ret, location, index.index, index.level);
                    PUSH_LABEL(ret, end_label);
                }
                optional_index++;
                break;
              }
              case PM_REQUIRED_KEYWORD_PARAMETER_NODE:
                // def foo(a, (b, *c, d), e = 1, *f, g, (h, *i, j), k:, l: 1, **m, &n)
                //                                                   ^^
                break;
              default:
                rb_bug("Unexpected keyword parameter node type %s", pm_node_type(PM_NODE_TYPE(keyword_parameter_node)));
            }
        }
    }
 
    if (requireds_list && requireds_list->size) {
        for (size_t i = 0; i < requireds_list->size; i++) {
            // For each MultiTargetNode, we're going to have one additional
            // anonymous local not represented in the locals table. We want
            // to account for this in our table size.
            const pm_node_t *required = requireds_list->nodes[i];
 
            if (PM_NODE_TYPE_P(required, PM_MULTI_TARGET_NODE)) {
                PUSH_GETLOCAL(ret, location, table_size - (int)i, 0);
                pm_compile_destructured_param_writes(iseq, (const pm_multi_target_node_t *) required, ret, scope_node);
            }
        }
    }
 
    if (posts_list && posts_list->size) {
        for (size_t i = 0; i < posts_list->size; i++) {
            // For each MultiTargetNode, we're going to have one additional
            // anonymous local not represented in the locals table. We want
            // to account for this in our table size.
            const pm_node_t *post = posts_list->nodes[i];
 
            if (PM_NODE_TYPE_P(post, PM_MULTI_TARGET_NODE)) {
                PUSH_GETLOCAL(ret, location, table_size - body->param.post_start - (int) i, 0);
                pm_compile_destructured_param_writes(iseq, (const pm_multi_target_node_t *) post, ret, scope_node);
            }
        }
    }
 
    switch (body->type) {
      case ISEQ_TYPE_PLAIN: {
        RUBY_ASSERT(PM_NODE_TYPE_P(scope_node->ast_node, PM_INTERPOLATED_REGULAR_EXPRESSION_NODE));
 
        const pm_interpolated_regular_expression_node_t *cast = (const pm_interpolated_regular_expression_node_t *) scope_node->ast_node;
        pm_compile_regexp_dynamic(iseq, (const pm_node_t *) cast, &cast->parts, &location, ret, popped, scope_node);
 
        break;
      }
      case ISEQ_TYPE_BLOCK: {
        LABEL *start = ISEQ_COMPILE_DATA(iseq)->start_label = NEW_LABEL(0);
        LABEL *end = ISEQ_COMPILE_DATA(iseq)->end_label = NEW_LABEL(0);
        const pm_node_location_t block_location = { .line = body->location.first_lineno, .node_id = scope_node->ast_node->node_id };
 
        start->rescued = LABEL_RESCUE_BEG;
        end->rescued = LABEL_RESCUE_END;
 
        // For nodes automatically assign the iteration variable to whatever
        // index variable. We need to handle that write here because it has
        // to happen in the context of the block. Note that this happens
        // before the B_CALL tracepoint event.
        if (PM_NODE_TYPE_P(scope_node->ast_node, PM_FOR_NODE)) {
            pm_compile_for_node_index(iseq, ((const pm_for_node_t *) scope_node->ast_node)->index, ret, scope_node);
        }
 
        PUSH_TRACE(ret, RUBY_EVENT_B_CALL);
        PUSH_INSN(ret, block_location, nop);
        PUSH_LABEL(ret, start);
 
        if (scope_node->body != NULL) {
            switch (PM_NODE_TYPE(scope_node->ast_node)) {
              case PM_POST_EXECUTION_NODE: {
                const pm_post_execution_node_t *cast = (const pm_post_execution_node_t *) scope_node->ast_node;
                PUSH_INSN1(ret, block_location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
                // We create another ScopeNode from the statements within the PostExecutionNode
                pm_scope_node_t next_scope_node;
                pm_scope_node_init((const pm_node_t *) cast->statements, &next_scope_node, scope_node);
 
                const rb_iseq_t *block = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(body->parent_iseq), ISEQ_TYPE_BLOCK, location.line);
                pm_scope_node_destroy(&next_scope_node);
 
                PUSH_CALL_WITH_BLOCK(ret, block_location, id_core_set_postexe, INT2FIX(0), block);
                break;
              }
              case PM_INTERPOLATED_REGULAR_EXPRESSION_NODE: {
                const pm_interpolated_regular_expression_node_t *cast = (const pm_interpolated_regular_expression_node_t *) scope_node->ast_node;
                pm_compile_regexp_dynamic(iseq, (const pm_node_t *) cast, &cast->parts, &location, ret, popped, scope_node);
                break;
              }
              default:
                pm_compile_node(iseq, scope_node->body, ret, popped, scope_node);
                break;
            }
        }
        else {
            PUSH_INSN(ret, block_location, putnil);
        }
 
        PUSH_LABEL(ret, end);
        PUSH_TRACE(ret, RUBY_EVENT_B_RETURN);
        ISEQ_COMPILE_DATA(iseq)->last_line = body->location.code_location.end_pos.lineno;
 
        /* wide range catch handler must put at last */
        PUSH_CATCH_ENTRY(CATCH_TYPE_REDO, start, end, NULL, start);
        PUSH_CATCH_ENTRY(CATCH_TYPE_NEXT, start, end, NULL, end);
        break;
      }
      case ISEQ_TYPE_ENSURE: {
        const pm_node_location_t statements_location = (scope_node->body != NULL ? PM_NODE_START_LOCATION(scope_node->body) : location);
        iseq_set_exception_local_table(iseq);
 
        if (scope_node->body != NULL) {
            PM_COMPILE_POPPED((const pm_node_t *) scope_node->body);
        }
 
        PUSH_GETLOCAL(ret, statements_location, 1, 0);
        PUSH_INSN1(ret, statements_location, throw, INT2FIX(0));
        return;
      }
      case ISEQ_TYPE_METHOD: {
        ISEQ_COMPILE_DATA(iseq)->root_node = (const void *) scope_node->body;
        PUSH_TRACE(ret, RUBY_EVENT_CALL);
 
        if (scope_node->body) {
            PM_COMPILE((const pm_node_t *) scope_node->body);
        }
        else {
            PUSH_INSN(ret, location, putnil);
        }
 
        ISEQ_COMPILE_DATA(iseq)->root_node = (const void *) scope_node->body;
        PUSH_TRACE(ret, RUBY_EVENT_RETURN);
 
        ISEQ_COMPILE_DATA(iseq)->last_line = body->location.code_location.end_pos.lineno;
        break;
      }
      case ISEQ_TYPE_RESCUE: {
        iseq_set_exception_local_table(iseq);
        if (PM_NODE_TYPE_P(scope_node->ast_node, PM_RESCUE_MODIFIER_NODE)) {
            LABEL *lab = NEW_LABEL(location.line);
            LABEL *rescue_end = NEW_LABEL(location.line);
            PUSH_GETLOCAL(ret, location, LVAR_ERRINFO, 0);
            PUSH_INSN1(ret, location, putobject, rb_eStandardError);
            PUSH_INSN1(ret, location, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE));
            PUSH_INSNL(ret, location, branchif, lab);
            PUSH_INSNL(ret, location, jump, rescue_end);
            PUSH_LABEL(ret, lab);
            PUSH_TRACE(ret, RUBY_EVENT_RESCUE);
            PM_COMPILE((const pm_node_t *) scope_node->body);
            PUSH_INSN(ret, location, leave);
            PUSH_LABEL(ret, rescue_end);
            PUSH_GETLOCAL(ret, location, LVAR_ERRINFO, 0);
        }
        else {
            PM_COMPILE((const pm_node_t *) scope_node->ast_node);
        }
        PUSH_INSN1(ret, location, throw, INT2FIX(0));
 
        return;
      }
      default:
        if (scope_node->body) {
            PM_COMPILE((const pm_node_t *) scope_node->body);
        }
        else {
            PUSH_INSN(ret, location, putnil);
        }
        break;
    }
 
    if (PM_NODE_TYPE_P(scope_node->ast_node, PM_CLASS_NODE) || PM_NODE_TYPE_P(scope_node->ast_node, PM_MODULE_NODE)) {
        const pm_node_location_t end_location = PM_NODE_END_LOCATION(scope_node->ast_node);
        PUSH_TRACE(ret, RUBY_EVENT_END);
        ISEQ_COMPILE_DATA(iseq)->last_line = end_location.line;
    }
 
    if (!PM_NODE_TYPE_P(scope_node->ast_node, PM_ENSURE_NODE)) {
        const pm_node_location_t location = { .line = ISEQ_COMPILE_DATA(iseq)->last_line, .node_id = scope_node->ast_node->node_id };
        PUSH_INSN(ret, location, leave);
    }
}
 
static inline void
pm_compile_alias_global_variable_node(rb_iseq_t *iseq, const pm_alias_global_variable_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    // alias $foo $bar
    // ^^^^^^^^^^^^^^^
    PUSH_INSN1(ret, *location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
    {
        const pm_location_t *name_loc = &node->new_name->location;
        VALUE operand = ID2SYM(rb_intern3((const char *) (pm_parser_start(scope_node->parser) + name_loc->start), name_loc->length, scope_node->encoding));
        PUSH_INSN1(ret, *location, putobject, operand);
    }
 
    {
        const pm_location_t *name_loc = &node->old_name->location;
        VALUE operand = ID2SYM(rb_intern3((const char *) (pm_parser_start(scope_node->parser) + name_loc->start), name_loc->length, scope_node->encoding));
        PUSH_INSN1(ret, *location, putobject, operand);
    }
 
    PUSH_SEND(ret, *location, id_core_set_variable_alias, INT2FIX(2));
    if (popped) PUSH_INSN(ret, *location, pop);
}
 
static inline void
pm_compile_alias_method_node(rb_iseq_t *iseq, const pm_alias_method_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    PUSH_INSN1(ret, *location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
    PUSH_INSN1(ret, *location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CBASE));
    PM_COMPILE_NOT_POPPED(node->new_name);
    PM_COMPILE_NOT_POPPED(node->old_name);
 
    PUSH_SEND(ret, *location, id_core_set_method_alias, INT2FIX(3));
    if (popped) PUSH_INSN(ret, *location, pop);
}
 
static inline void
pm_compile_and_node(rb_iseq_t *iseq, const pm_and_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    LABEL *end_label = NEW_LABEL(location->line);
 
    PM_COMPILE_NOT_POPPED(node->left);
    if (!popped) PUSH_INSN(ret, *location, dup);
    PUSH_INSNL(ret, *location, branchunless, end_label);
 
    if (!popped) PUSH_INSN(ret, *location, pop);
    PM_COMPILE(node->right);
    PUSH_LABEL(ret, end_label);
}
 
static inline void
pm_compile_array_node(rb_iseq_t *iseq, const pm_node_t *node, const pm_node_list_t *elements, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    // If every node in the array is static, then we can compile the entire
    // array now instead of later.
    if (PM_NODE_FLAG_P(node, PM_NODE_FLAG_STATIC_LITERAL)) {
        // We're only going to compile this node if it's not popped. If it
        // is popped, then we know we don't need to do anything since it's
        // statically known.
        if (!popped) {
            if (elements->size) {
                VALUE value = pm_static_literal_value(iseq, node, scope_node);
                RB_OBJ_SET_FROZEN_SHAREABLE(value);
                PUSH_INSN1(ret, *location, duparray, value);
            }
            else {
                PUSH_INSN1(ret, *location, newarray, INT2FIX(0));
            }
        }
        return;
    }
 
    // Here since we know there are possible side-effects inside the
    // array contents, we're going to build it entirely at runtime.
    // We'll do this by pushing all of the elements onto the stack and
    // then combining them with newarray.
    //
    // If this array is popped, then this serves only to ensure we enact
    // all side-effects (like method calls) that are contained within
    // the array contents.
    //
    // We treat all sequences of non-splat elements as their
    // own arrays, followed by a newarray, and then continually
    // concat the arrays with the SplatNode nodes.
    const int max_new_array_size = 0x100;
    const unsigned int min_tmp_array_size = 0x40;
 
    int new_array_size = 0;
    bool first_chunk = true;
 
    // This is an optimization wherein we keep track of whether or not
    // the previous element was a static literal. If it was, then we do
    // not attempt to check if we have a subarray that can be optimized.
    // If it was not, then we do check.
    bool static_literal = false;
 
    // Either create a new array, or push to the existing array.
#define FLUSH_CHUNK \
    if (new_array_size) {                                                               \
        if (first_chunk) PUSH_INSN1(ret, *location, newarray, INT2FIX(new_array_size)); \
        else PUSH_INSN1(ret, *location, pushtoarray, INT2FIX(new_array_size));          \
        first_chunk = false;                                                            \
        new_array_size = 0;                                                             \
    }
 
    for (size_t index = 0; index < elements->size; index++) {
        const pm_node_t *element = elements->nodes[index];
 
        if (PM_NODE_TYPE_P(element, PM_SPLAT_NODE)) {
            FLUSH_CHUNK;
 
            const pm_splat_node_t *splat_element = (const pm_splat_node_t *) element;
            if (splat_element->expression) {
                PM_COMPILE_NOT_POPPED(splat_element->expression);
            }
            else {
                pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_MULT, 0);
                PUSH_GETLOCAL(ret, *location, index.index, index.level);
            }
 
            if (first_chunk) {
                // If this is the first element of the array then we
                // need to splatarray the elements into the list.
                PUSH_INSN1(ret, *location, splatarray, Qtrue);
                first_chunk = false;
            }
            else {
                PUSH_INSN(ret, *location, concattoarray);
            }
 
            static_literal = false;
        }
        else if (PM_NODE_TYPE_P(element, PM_KEYWORD_HASH_NODE)) {
            if (new_array_size == 0 && first_chunk) {
                PUSH_INSN1(ret, *location, newarray, INT2FIX(0));
                first_chunk = false;
            }
            else {
                FLUSH_CHUNK;
            }
 
            // If we get here, then this is the last element of the
            // array/arguments, because it cannot be followed by
            // anything else without a syntax error. This looks like:
            //
            //     [foo, bar, baz: qux]
            //                ^^^^^^^^
            //
            //     [foo, bar, **baz]
            //                ^^^^^
            //
            const pm_keyword_hash_node_t *keyword_hash = (const pm_keyword_hash_node_t *) element;
            pm_compile_hash_elements(iseq, element, &keyword_hash->elements, 0, Qundef, false, ret, scope_node);
 
            // This boolean controls the manner in which we push the
            // hash onto the array. If it's all keyword splats, then we
            // can use the very specialized pushtoarraykwsplat
            // instruction to check if it's empty before we push it.
            size_t splats = 0;
            while (splats < keyword_hash->elements.size && PM_NODE_TYPE_P(keyword_hash->elements.nodes[splats], PM_ASSOC_SPLAT_NODE)) splats++;
 
            if (keyword_hash->elements.size == splats) {
                PUSH_INSN(ret, *location, pushtoarraykwsplat);
            }
            else {
                new_array_size++;
            }
        }
        else if (
            PM_NODE_FLAG_P(element, PM_NODE_FLAG_STATIC_LITERAL) &&
            !PM_CONTAINER_P(element) &&
            !static_literal &&
            ((index + min_tmp_array_size) < elements->size)
        ) {
            // If we have a static literal, then there's the potential
            // to group a bunch of them together with a literal array
            // and then concat them together.
            size_t right_index = index + 1;
            while (
                right_index < elements->size &&
                PM_NODE_FLAG_P(elements->nodes[right_index], PM_NODE_FLAG_STATIC_LITERAL) &&
                !PM_CONTAINER_P(elements->nodes[right_index])
            ) right_index++;
 
            size_t tmp_array_size = right_index - index;
            if (tmp_array_size >= min_tmp_array_size) {
                VALUE tmp_array = rb_ary_hidden_new(tmp_array_size);
 
                // Create the temporary array.
                for (; tmp_array_size; tmp_array_size--)
                    rb_ary_push(tmp_array, pm_static_literal_value(iseq, elements->nodes[index++], scope_node));
 
                index--; // about to be incremented by for loop
                RB_OBJ_SET_FROZEN_SHAREABLE(tmp_array);
 
                // Emit the optimized code.
                FLUSH_CHUNK;
                if (first_chunk) {
                    PUSH_INSN1(ret, *location, duparray, tmp_array);
                    first_chunk = false;
                }
                else {
                    PUSH_INSN1(ret, *location, putobject, tmp_array);
                    PUSH_INSN(ret, *location, concattoarray);
                }
            }
            else {
                PM_COMPILE_NOT_POPPED(element);
                if (++new_array_size >= max_new_array_size) FLUSH_CHUNK;
                static_literal = true;
            }
        } else {
            PM_COMPILE_NOT_POPPED(element);
            if (++new_array_size >= max_new_array_size) FLUSH_CHUNK;
            static_literal = false;
        }
    }
 
    FLUSH_CHUNK;
    if (popped) PUSH_INSN(ret, *location, pop);
 
#undef FLUSH_CHUNK
}
 
static inline void
pm_compile_break_node(rb_iseq_t *iseq, const pm_break_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    unsigned long throw_flag = 0;
 
    if (ISEQ_COMPILE_DATA(iseq)->redo_label != 0 && can_add_ensure_iseq(iseq)) {
        /* while/until */
        LABEL *splabel = NEW_LABEL(0);
        PUSH_LABEL(ret, splabel);
        PUSH_ADJUST(ret, *location, ISEQ_COMPILE_DATA(iseq)->redo_label);
 
        if (node->arguments != NULL) {
            PM_COMPILE_NOT_POPPED((const pm_node_t *) node->arguments);
        }
        else {
            PUSH_INSN(ret, *location, putnil);
        }
 
        pm_add_ensure_iseq(ret, iseq, 0, scope_node);
        PUSH_INSNL(ret, *location, jump, ISEQ_COMPILE_DATA(iseq)->end_label);
        PUSH_ADJUST_RESTORE(ret, splabel);
        if (!popped) PUSH_INSN(ret, *location, putnil);
    }
    else {
        const rb_iseq_t *ip = iseq;
 
        while (ip) {
            if (!ISEQ_COMPILE_DATA(ip)) {
                ip = 0;
                break;
            }
 
            if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
                throw_flag = VM_THROW_NO_ESCAPE_FLAG;
            }
            else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_BLOCK) {
                throw_flag = 0;
            }
            else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_EVAL) {
                COMPILE_ERROR(iseq, location->line, "Invalid break");
                return;
            }
            else {
                ip = ISEQ_BODY(ip)->parent_iseq;
                continue;
            }
 
            /* escape from block */
            if (node->arguments != NULL) {
                PM_COMPILE_NOT_POPPED((const pm_node_t *) node->arguments);
            }
            else {
                PUSH_INSN(ret, *location, putnil);
            }
 
            PUSH_INSN1(ret, *location, throw, INT2FIX(throw_flag | TAG_BREAK));
            if (popped) PUSH_INSN(ret, *location, pop);
 
            return;
        }
 
        COMPILE_ERROR(iseq, location->line, "Invalid break");
    }
}
 
static inline void
pm_compile_call_node(rb_iseq_t *iseq, const pm_call_node_t *node, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    ID method_id = pm_constant_id_lookup(scope_node, node->name);
 
    const pm_location_t *message_loc = &node->message_loc;
    if (message_loc->length == 0) message_loc = &node->base.location;
 
    const pm_node_location_t location = PM_LOCATION_START_LOCATION(message_loc, node->base.node_id);
    const char *builtin_func;
 
    if (UNLIKELY(iseq_has_builtin_function_table(iseq)) && (builtin_func = pm_iseq_builtin_function_name(scope_node, node->receiver, method_id)) != NULL) {
        pm_compile_builtin_function_call(iseq, ret, scope_node, node, &location, popped, ISEQ_COMPILE_DATA(iseq)->current_block, builtin_func);
        return;
    }
 
    LABEL *start = NEW_LABEL(location.line);
    if (node->block) PUSH_LABEL(ret, start);
 
    switch (method_id) {
      case idUMinus: {
        if (pm_opt_str_freeze_p(iseq, node)) {
            VALUE value = parse_static_literal_string(iseq, scope_node, node->receiver, &((const pm_string_node_t * ) node->receiver)->unescaped);
            const struct rb_callinfo *callinfo = new_callinfo(iseq, idUMinus, 0, 0, NULL, FALSE);
            PUSH_INSN2(ret, location, opt_str_uminus, value, callinfo);
            if (popped) PUSH_INSN(ret, location, pop);
            return;
        }
        break;
      }
      case idFreeze: {
        if (pm_opt_str_freeze_p(iseq, node)) {
            VALUE value = parse_static_literal_string(iseq, scope_node, node->receiver, &((const pm_string_node_t * ) node->receiver)->unescaped);
            const struct rb_callinfo *callinfo = new_callinfo(iseq, idFreeze, 0, 0, NULL, FALSE);
            PUSH_INSN2(ret, location, opt_str_freeze, value, callinfo);
            if (popped) PUSH_INSN(ret, location, pop);
            return;
        }
        break;
      }
    }
 
    if (PM_NODE_FLAG_P(node, PM_CALL_NODE_FLAGS_ATTRIBUTE_WRITE) && !popped) {
        PUSH_INSN(ret, location, putnil);
    }
 
    if (node->receiver == NULL) {
        PUSH_INSN(ret, location, putself);
    }
    else {
        if ((method_id == idCall || method_id == idAREF || method_id == idYield || method_id == idEqq) && PM_NODE_TYPE_P(node->receiver, PM_LOCAL_VARIABLE_READ_NODE)) {
            const pm_local_variable_read_node_t *read_node_cast = (const pm_local_variable_read_node_t *) node->receiver;
            uint32_t node_id = node->receiver->node_id;
            int idx, level;
 
            if (iseq_block_param_id_p(iseq, pm_constant_id_lookup(scope_node, read_node_cast->name), &idx, &level)) {
                ADD_ELEM(ret, (LINK_ELEMENT *) new_insn_body(iseq, location.line, node_id, BIN(getblockparamproxy), 2, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level)));
            }
            else {
                PM_COMPILE_NOT_POPPED(node->receiver);
            }
        }
        else {
            PM_COMPILE_NOT_POPPED(node->receiver);
        }
    }
 
    pm_compile_call(iseq, node, ret, popped, scope_node, method_id, start);
    return;
}
 
static inline void
pm_compile_call_operator_write_node(rb_iseq_t *iseq, const pm_call_operator_write_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    int flag = 0;
 
    if (PM_NODE_FLAG_P(node, PM_CALL_NODE_FLAGS_IGNORE_VISIBILITY)) {
        flag = VM_CALL_FCALL;
    }
 
    PM_COMPILE_NOT_POPPED(node->receiver);
 
    LABEL *safe_label = NULL;
    if (PM_NODE_FLAG_P(node, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION)) {
        safe_label = NEW_LABEL(location->line);
        PUSH_INSN(ret, *location, dup);
        PUSH_INSNL(ret, *location, branchnil, safe_label);
    }
 
    PUSH_INSN(ret, *location, dup);
 
    ID id_read_name = pm_constant_id_lookup(scope_node, node->read_name);
    PUSH_SEND_WITH_FLAG(ret, *location, id_read_name, INT2FIX(0), INT2FIX(flag));
 
    PM_COMPILE_NOT_POPPED(node->value);
    ID id_operator = pm_constant_id_lookup(scope_node, node->binary_operator);
    PUSH_SEND(ret, *location, id_operator, INT2FIX(1));
 
    if (!popped) {
        PUSH_INSN(ret, *location, swap);
        PUSH_INSN1(ret, *location, topn, INT2FIX(1));
    }
 
    ID id_write_name = pm_constant_id_lookup(scope_node, node->write_name);
    PUSH_SEND_WITH_FLAG(ret, *location, id_write_name, INT2FIX(1), INT2FIX(flag));
 
    if (safe_label != NULL && popped) PUSH_LABEL(ret, safe_label);
    PUSH_INSN(ret, *location, pop);
    if (safe_label != NULL && !popped) PUSH_LABEL(ret, safe_label);
}
 
static VALUE
pm_compile_case_node_dispatch(rb_iseq_t *iseq, VALUE dispatch, const pm_node_t *node, LABEL *label, pm_scope_node_t *scope_node)
{
    VALUE key = Qundef;
    switch (PM_NODE_TYPE(node)) {
      case PM_FLOAT_NODE: {
        key = pm_static_literal_value(iseq, node, scope_node);
        double intptr;
 
        if (modf(RFLOAT_VALUE(key), &intptr) == 0.0) {
            key = (FIXABLE(intptr) ? LONG2FIX((long) intptr) : rb_dbl2big(intptr));
        }
 
        break;
      }
      case PM_FALSE_NODE:
      case PM_INTEGER_NODE:
      case PM_NIL_NODE:
      case PM_SOURCE_LINE_NODE:
      case PM_SYMBOL_NODE:
      case PM_TRUE_NODE:
        key = pm_static_literal_value(iseq, node, scope_node);
        break;
      case PM_STRING_NODE: {
        const pm_string_node_t *cast = (const pm_string_node_t *) node;
        key = parse_static_literal_string(iseq, scope_node, node, &cast->unescaped);
        break;
      }
      default:
        return Qundef;
    }
 
    cdhash_aset_if_missing(dispatch, key, (VALUE)label);
    return dispatch;
}
 
static inline void
pm_compile_case_node(rb_iseq_t *iseq, const pm_case_node_t *cast, const pm_node_location_t *node_location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = *node_location;
    const pm_node_list_t *conditions = &cast->conditions;
 
    // This is the anchor that we will compile the conditions of the various
    // `when` nodes into. If a match is found, they will need to jump into
    // the body_seq anchor to the correct spot.
    DECL_ANCHOR(cond_seq);
 
    // This is the anchor that we will compile the bodies of the various
    // `when` nodes into. We'll make sure that the clauses that are compiled
    // jump into the correct spots within this anchor.
    DECL_ANCHOR(body_seq);
 
    // This is the label where all of the when clauses will jump to if they
    // have matched and are done executing their bodies.
    LABEL *end_label = NEW_LABEL(location.line);
 
    // If we have a predicate on this case statement, then it's going to
    // compare all of the various when clauses to the predicate. If we
    // don't, then it's basically an if-elsif-else chain.
    if (cast->predicate == NULL) {
        // Establish branch coverage for the case node.
        VALUE branches = Qfalse;
        rb_code_location_t case_location = { 0 };
        int branch_id = 0;
 
        if (PM_BRANCH_COVERAGE_P(iseq)) {
            case_location = pm_code_location(scope_node, (const pm_node_t *) cast);
            branches = decl_branch_base(iseq, (int) cast->base.node_id, &case_location, "case");
        }
 
        // Loop through each clauses in the case node and compile each of
        // the conditions within them into cond_seq. If they match, they
        // should jump into their respective bodies in body_seq.
        for (size_t clause_index = 0; clause_index < conditions->size; clause_index++) {
            const pm_when_node_t *clause = (const pm_when_node_t *) conditions->nodes[clause_index];
            const pm_node_list_t *conditions = &clause->conditions;
 
            int clause_lineno = pm_node_line_number_cached((const pm_node_t *) clause, scope_node);
            LABEL *label = NEW_LABEL(clause_lineno);
            PUSH_LABEL(body_seq, label);
 
            // Establish branch coverage for the when clause.
            if (PM_BRANCH_COVERAGE_P(iseq)) {
                rb_code_location_t branch_location = pm_code_location(scope_node, clause->statements != NULL ? ((const pm_node_t *) clause->statements) : ((const pm_node_t *) clause));
                add_trace_branch_coverage(iseq, body_seq, &branch_location, branch_location.beg_pos.column, branch_id++, "when", branches);
            }
 
            if (clause->statements != NULL) {
                pm_compile_node(iseq, (const pm_node_t *) clause->statements, body_seq, popped, scope_node);
            }
            else if (!popped) {
                PUSH_SYNTHETIC_PUTNIL(body_seq, iseq);
            }
 
            PUSH_INSNL(body_seq, location, jump, end_label);
 
            // Compile each of the conditions for the when clause into the
            // cond_seq. Each one should have a unique condition and should
            // jump to the subsequent one if it doesn't match.
            for (size_t condition_index = 0; condition_index < conditions->size; condition_index++) {
                const pm_node_t *condition = conditions->nodes[condition_index];
 
                if (PM_NODE_TYPE_P(condition, PM_SPLAT_NODE)) {
                    pm_node_location_t cond_location = PM_NODE_START_LOCATION(condition);
                    PUSH_INSN(cond_seq, cond_location, putnil);
                    pm_compile_node(iseq, condition, cond_seq, false, scope_node);
                    PUSH_INSN1(cond_seq, cond_location, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_WHEN | VM_CHECKMATCH_ARRAY));
                    PUSH_INSNL(cond_seq, cond_location, branchif, label);
                }
                else {
                    LABEL *next_label = NEW_LABEL(pm_node_line_number_cached(condition, scope_node));
                    pm_compile_branch_condition(iseq, cond_seq, condition, label, next_label, scope_node);
                    PUSH_LABEL(cond_seq, next_label);
                }
            }
        }
 
        // Establish branch coverage for the else clause (implicit or
        // explicit).
        if (PM_BRANCH_COVERAGE_P(iseq)) {
            rb_code_location_t branch_location;
 
            if (cast->else_clause == NULL) {
                branch_location = case_location;
            } else if (cast->else_clause->statements == NULL) {
                branch_location = pm_code_location(scope_node, (const pm_node_t *) cast->else_clause);
            } else {
                branch_location = pm_code_location(scope_node, (const pm_node_t *) cast->else_clause->statements);
            }
 
            add_trace_branch_coverage(iseq, cond_seq, &branch_location, branch_location.beg_pos.column, branch_id, "else", branches);
        }
 
        // Compile the else clause if there is one.
        if (cast->else_clause != NULL) {
            pm_compile_node(iseq, (const pm_node_t *) cast->else_clause, cond_seq, popped, scope_node);
        }
        else if (!popped) {
            PUSH_SYNTHETIC_PUTNIL(cond_seq, iseq);
        }
 
        // Finally, jump to the end label if none of the other conditions
        // have matched.
        PUSH_INSNL(cond_seq, location, jump, end_label);
        PUSH_SEQ(ret, cond_seq);
    }
    else {
        // Establish branch coverage for the case node.
        VALUE branches = Qfalse;
        rb_code_location_t case_location = { 0 };
        int branch_id = 0;
 
        if (PM_BRANCH_COVERAGE_P(iseq)) {
            case_location = pm_code_location(scope_node, (const pm_node_t *) cast);
            branches = decl_branch_base(iseq, (int) cast->base.node_id, &case_location, "case");
        }
 
        // This is the label where everything will fall into if none of the
        // conditions matched.
        LABEL *else_label = NEW_LABEL(location.line);
 
        // It's possible for us to speed up the case node by using a
        // dispatch hash. This is a hash that maps the conditions of the
        // various when clauses to the labels of their bodies. If we can
        // compile the conditions into a hash key, then we can use a hash
        // lookup to jump directly to the correct when clause body.
        VALUE dispatch = Qundef;
        if (ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction) {
            dispatch = cdhash_new(0);
        }
 
        // We're going to loop through each of the conditions in the case
        // node and compile each of their contents into both the cond_seq
        // and the body_seq. Each condition will use its own label to jump
        // from its conditions into its body.
        //
        // Note that none of the code in the loop below should be adding
        // anything to ret, as we're going to be laying out the entire case
        // node instructions later.
        for (size_t clause_index = 0; clause_index < conditions->size; clause_index++) {
            const pm_when_node_t *clause = (const pm_when_node_t *) conditions->nodes[clause_index];
            pm_node_location_t clause_location = PM_NODE_START_LOCATION((const pm_node_t *) clause);
 
            const pm_node_list_t *conditions = &clause->conditions;
            LABEL *label = NEW_LABEL(clause_location.line);
 
            // Compile each of the conditions for the when clause into the
            // cond_seq. Each one should have a unique comparison that then
            // jumps into the body if it matches.
            for (size_t condition_index = 0; condition_index < conditions->size; condition_index++) {
                const pm_node_t *condition = conditions->nodes[condition_index];
                const pm_node_location_t condition_location = PM_NODE_START_LOCATION(condition);
 
                // If we haven't already abandoned the optimization, then
                // we're going to try to compile the condition into the
                // dispatch hash.
                if (dispatch != Qundef) {
                    dispatch = pm_compile_case_node_dispatch(iseq, dispatch, condition, label, scope_node);
                }
 
                if (PM_NODE_TYPE_P(condition, PM_SPLAT_NODE)) {
                    PUSH_INSN(cond_seq, condition_location, dup);
                    pm_compile_node(iseq, condition, cond_seq, false, scope_node);
                    PUSH_INSN1(cond_seq, condition_location, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_CASE | VM_CHECKMATCH_ARRAY));
                }
                else {
                    if (PM_NODE_TYPE_P(condition, PM_STRING_NODE)) {
                        const pm_string_node_t *string = (const pm_string_node_t *) condition;
                        VALUE value = parse_static_literal_string(iseq, scope_node, condition, &string->unescaped);
                        PUSH_INSN1(cond_seq, condition_location, putobject, value);
                    }
                    else {
                        pm_compile_node(iseq, condition, cond_seq, false, scope_node);
                    }
 
                    PUSH_INSN1(cond_seq, condition_location, topn, INT2FIX(1));
                    PUSH_SEND_WITH_FLAG(cond_seq, condition_location, idEqq, INT2NUM(1), INT2FIX(VM_CALL_FCALL | VM_CALL_ARGS_SIMPLE));
                }
 
                PUSH_INSNL(cond_seq, condition_location, branchif, label);
            }
 
            // Now, add the label to the body and compile the body of the
            // when clause. This involves popping the predicate, compiling
            // the statements to be executed, and then compiling a jump to
            // the end of the case node.
            PUSH_LABEL(body_seq, label);
            PUSH_INSN(body_seq, clause_location, pop);
 
            // Establish branch coverage for the when clause.
            if (PM_BRANCH_COVERAGE_P(iseq)) {
                rb_code_location_t branch_location = pm_code_location(scope_node, clause->statements != NULL ? ((const pm_node_t *) clause->statements) : ((const pm_node_t *) clause));
                add_trace_branch_coverage(iseq, body_seq, &branch_location, branch_location.beg_pos.column, branch_id++, "when", branches);
            }
 
            if (clause->statements != NULL) {
                pm_compile_node(iseq, (const pm_node_t *) clause->statements, body_seq, popped, scope_node);
            }
            else if (!popped) {
                PUSH_SYNTHETIC_PUTNIL(body_seq, iseq);
            }
 
            PUSH_INSNL(body_seq, clause_location, jump, end_label);
        }
 
        // Now that we have compiled the conditions and the bodies of the
        // various when clauses, we can compile the predicate, lay out the
        // conditions, compile the fallback subsequent if there is one, and
        // finally put in the bodies of the when clauses.
        PM_COMPILE_NOT_POPPED(cast->predicate);
 
        // If we have a dispatch hash, then we'll use it here to create the
        // optimization.
        if (dispatch != Qundef) {
            PUSH_INSN(ret, location, dup);
            RB_OBJ_SET_SHAREABLE(dispatch); // it is special that the hash is shareable but not frozen, because compile.c modify them. This Hahs instance is not accessible so it is safe to leave it.
            PUSH_INSN2(ret, location, opt_case_dispatch, dispatch, else_label);
            LABEL_REF(else_label);
        }
 
        PUSH_SEQ(ret, cond_seq);
 
        // Compile either the explicit else clause or an implicit else
        // clause.
        PUSH_LABEL(ret, else_label);
 
        if (cast->else_clause != NULL) {
            pm_node_location_t else_location = PM_NODE_START_LOCATION(cast->else_clause->statements != NULL ? ((const pm_node_t *) cast->else_clause->statements) : ((const pm_node_t *) cast->else_clause));
            PUSH_INSN(ret, else_location, pop);
 
            // Establish branch coverage for the else clause.
            if (PM_BRANCH_COVERAGE_P(iseq)) {
                rb_code_location_t branch_location = pm_code_location(scope_node, cast->else_clause->statements != NULL ? ((const pm_node_t *) cast->else_clause->statements) : ((const pm_node_t *) cast->else_clause));
                add_trace_branch_coverage(iseq, ret, &branch_location, branch_location.beg_pos.column, branch_id, "else", branches);
            }
 
            PM_COMPILE((const pm_node_t *) cast->else_clause);
            PUSH_INSNL(ret, else_location, jump, end_label);
        }
        else {
            PUSH_INSN(ret, location, pop);
 
            // Establish branch coverage for the implicit else clause.
            if (PM_BRANCH_COVERAGE_P(iseq)) {
                add_trace_branch_coverage(iseq, ret, &case_location, case_location.beg_pos.column, branch_id, "else", branches);
            }
 
            if (!popped) PUSH_INSN(ret, location, putnil);
            PUSH_INSNL(ret, location, jump, end_label);
        }
    }
 
    PUSH_SEQ(ret, body_seq);
    PUSH_LABEL(ret, end_label);
}
 
static inline void
pm_compile_case_match_node(rb_iseq_t *iseq, const pm_case_match_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    // This is the anchor that we will compile the bodies of the various
    // `in` nodes into. We'll make sure that the patterns that are compiled
    // jump into the correct spots within this anchor.
    DECL_ANCHOR(body_seq);
 
    // This is the anchor that we will compile the patterns of the various
    // `in` nodes into. If a match is found, they will need to jump into the
    // body_seq anchor to the correct spot.
    DECL_ANCHOR(cond_seq);
 
    // This label is used to indicate the end of the entire node. It is
    // jumped to after the entire stack is cleaned up.
    LABEL *end_label = NEW_LABEL(location->line);
 
    // This label is used as the fallback for the case match. If no match is
    // found, then we jump to this label. This is either an `else` clause or
    // an error handler.
    LABEL *else_label = NEW_LABEL(location->line);
 
    // We're going to use this to uniquely identify each branch so that we
    // can track coverage information.
    rb_code_location_t case_location = { 0 };
    VALUE branches = Qfalse;
    int branch_id = 0;
 
    if (PM_BRANCH_COVERAGE_P(iseq)) {
        case_location = pm_code_location(scope_node, (const pm_node_t *) node);
        branches = decl_branch_base(iseq, (int) node->base.node_id, &case_location, "case");
    }
 
    // If there is only one pattern, then the behavior changes a bit. It
    // effectively gets treated as a match required node (this is how it is
    // represented in the other parser).
    bool in_single_pattern = node->else_clause == NULL && node->conditions.size == 1;
 
    // First, we're going to push a bunch of stuff onto the stack that is
    // going to serve as our scratch space.
    if (in_single_pattern) {
        PUSH_INSN(ret, *location, putnil); // key error key
        PUSH_INSN(ret, *location, putnil); // key error matchee
        PUSH_INSN1(ret, *location, putobject, Qfalse); // key error?
        PUSH_INSN(ret, *location, putnil); // error string
    }
 
    // Now we're going to compile the value to match against.
    PUSH_INSN(ret, *location, putnil); // deconstruct cache
    PM_COMPILE_NOT_POPPED(node->predicate);
 
    // Next, we'll loop through every in clause and compile its body into
    // the body_seq anchor and its pattern into the cond_seq anchor. We'll
    // make sure the pattern knows how to jump correctly into the body if it
    // finds a match.
    for (size_t index = 0; index < node->conditions.size; index++) {
        const pm_node_t *condition = node->conditions.nodes[index];
        RUBY_ASSERT(PM_NODE_TYPE_P(condition, PM_IN_NODE));
 
        const pm_in_node_t *in_node = (const pm_in_node_t *) condition;
        const pm_node_location_t in_location = PM_NODE_START_LOCATION(in_node);
        const pm_node_location_t pattern_location = PM_NODE_START_LOCATION(in_node->pattern);
 
        if (branch_id) {
            PUSH_INSN(body_seq, in_location, putnil);
        }
 
        LABEL *body_label = NEW_LABEL(in_location.line);
        PUSH_LABEL(body_seq, body_label);
        PUSH_INSN1(body_seq, in_location, adjuststack, INT2FIX(in_single_pattern ? 6 : 2));
 
        // Establish branch coverage for the in clause.
        if (PM_BRANCH_COVERAGE_P(iseq)) {
            rb_code_location_t branch_location = pm_code_location(scope_node, in_node->statements != NULL ? ((const pm_node_t *) in_node->statements) : ((const pm_node_t *) in_node));
            add_trace_branch_coverage(iseq, body_seq, &branch_location, branch_location.beg_pos.column, branch_id++, "in", branches);
        }
 
        if (in_node->statements != NULL) {
            PM_COMPILE_INTO_ANCHOR(body_seq, (const pm_node_t *) in_node->statements);
        }
        else if (!popped) {
            PUSH_SYNTHETIC_PUTNIL(body_seq, iseq);
        }
 
        PUSH_INSNL(body_seq, in_location, jump, end_label);
        LABEL *next_pattern_label = NEW_LABEL(pattern_location.line);
 
        PUSH_INSN(cond_seq, pattern_location, dup);
        pm_compile_pattern(iseq, scope_node, in_node->pattern, cond_seq, body_label, next_pattern_label, in_single_pattern, true, 2);
        PUSH_LABEL(cond_seq, next_pattern_label);
        LABEL_UNREMOVABLE(next_pattern_label);
    }
 
    if (node->else_clause != NULL) {
        // If we have an `else` clause, then this becomes our fallback (and
        // there is no need to compile in code to potentially raise an
        // error).
        const pm_else_node_t *else_node = node->else_clause;
 
        PUSH_LABEL(cond_seq, else_label);
        PUSH_INSN(cond_seq, *location, pop);
        PUSH_INSN(cond_seq, *location, pop);
 
        // Establish branch coverage for the else clause.
        if (PM_BRANCH_COVERAGE_P(iseq)) {
            rb_code_location_t branch_location = pm_code_location(scope_node, else_node->statements != NULL ? ((const pm_node_t *) else_node->statements) : ((const pm_node_t *) else_node));
            add_trace_branch_coverage(iseq, cond_seq, &branch_location, branch_location.beg_pos.column, branch_id, "else", branches);
        }
 
        PM_COMPILE_INTO_ANCHOR(cond_seq, (const pm_node_t *) else_node);
        PUSH_INSNL(cond_seq, *location, jump, end_label);
        PUSH_INSN(cond_seq, *location, putnil);
        if (popped) PUSH_INSN(cond_seq, *location, putnil);
    }
    else {
        // Otherwise, if we do not have an `else` clause, we will compile in
        // the code to handle raising an appropriate error.
        PUSH_LABEL(cond_seq, else_label);
 
        // Establish branch coverage for the implicit else clause.
        add_trace_branch_coverage(iseq, cond_seq, &case_location, case_location.beg_pos.column, branch_id, "else", branches);
 
        if (in_single_pattern) {
            pm_compile_pattern_error_handler(iseq, scope_node, (const pm_node_t *) node, cond_seq, end_label, popped);
        }
        else {
            PUSH_INSN1(cond_seq, *location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
            PUSH_INSN1(cond_seq, *location, putobject, rb_eNoMatchingPatternError);
            PUSH_INSN1(cond_seq, *location, topn, INT2FIX(2));
            PUSH_SEND(cond_seq, *location, id_core_raise, INT2FIX(2));
 
            PUSH_INSN1(cond_seq, *location, adjuststack, INT2FIX(3));
            if (!popped) PUSH_INSN(cond_seq, *location, putnil);
            PUSH_INSNL(cond_seq, *location, jump, end_label);
            PUSH_INSN1(cond_seq, *location, dupn, INT2FIX(1));
            if (popped) PUSH_INSN(cond_seq, *location, putnil);
        }
    }
 
    // At the end of all of this compilation, we will add the code for the
    // conditions first, then the various bodies, then mark the end of the
    // entire sequence with the end label.
    PUSH_SEQ(ret, cond_seq);
    PUSH_SEQ(ret, body_seq);
    PUSH_LABEL(ret, end_label);
}
 
static inline void
pm_compile_forwarding_super_node(rb_iseq_t *iseq, const pm_forwarding_super_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const rb_iseq_t *block = NULL;
    const rb_iseq_t *previous_block = NULL;
    LABEL *retry_label = NULL;
    LABEL *retry_end_l = NULL;
 
    if (node->block != NULL) {
        previous_block = ISEQ_COMPILE_DATA(iseq)->current_block;
        ISEQ_COMPILE_DATA(iseq)->current_block = NULL;
 
        retry_label = NEW_LABEL(location->line);
        retry_end_l = NEW_LABEL(location->line);
 
        PUSH_LABEL(ret, retry_label);
    }
    else {
        iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
    }
 
    PUSH_INSN(ret, *location, putself);
    int flag = VM_CALL_ZSUPER | VM_CALL_SUPER | VM_CALL_FCALL;
 
    if (node->block != NULL) {
        pm_scope_node_t next_scope_node;
        pm_scope_node_init((const pm_node_t *) node->block, &next_scope_node, scope_node);
 
        ISEQ_COMPILE_DATA(iseq)->current_block = block = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, location->line);
        pm_scope_node_destroy(&next_scope_node);
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE) block);
    }
 
    DECL_ANCHOR(args);
 
    struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
    const rb_iseq_t *local_iseq = body->local_iseq;
    const struct rb_iseq_constant_body *const local_body = ISEQ_BODY(local_iseq);
 
    int argc = 0;
    int depth = get_lvar_level(iseq);
 
    if (ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->param.flags.forwardable) {
        flag |= VM_CALL_FORWARDING;
        pm_local_index_t mult_local = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_DOT3, 0);
        PUSH_GETLOCAL(ret, *location, mult_local.index, mult_local.level);
 
        const struct rb_callinfo *callinfo = new_callinfo(iseq, 0, 0, flag, NULL, block != NULL);
        PUSH_INSN2(ret, *location, invokesuperforward, callinfo, block);
 
        if (popped) PUSH_INSN(ret, *location, pop);
        if (node->block) {
            ISEQ_COMPILE_DATA(iseq)->current_block = previous_block;
        }
        return;
    }
 
    if (local_body->param.flags.has_lead) {
        /* required arguments */
        for (int i = 0; i < local_body->param.lead_num; i++) {
            int idx = local_body->local_table_size - i;
            PUSH_GETLOCAL(args, *location, idx, depth);
        }
        argc += local_body->param.lead_num;
    }
 
    if (local_body->param.flags.has_opt) {
        /* optional arguments */
        for (int j = 0; j < local_body->param.opt_num; j++) {
            int idx = local_body->local_table_size - (argc + j);
            PUSH_GETLOCAL(args, *location, idx, depth);
        }
        argc += local_body->param.opt_num;
    }
 
    if (local_body->param.flags.has_rest) {
        /* rest argument */
        int idx = local_body->local_table_size - local_body->param.rest_start;
        PUSH_GETLOCAL(args, *location, idx, depth);
        PUSH_INSN1(args, *location, splatarray, Qfalse);
 
        argc = local_body->param.rest_start + 1;
        flag |= VM_CALL_ARGS_SPLAT;
    }
 
    if (local_body->param.flags.has_post) {
        /* post arguments */
        int post_len = local_body->param.post_num;
        int post_start = local_body->param.post_start;
 
        int j = 0;
        for (; j < post_len; j++) {
            int idx = local_body->local_table_size - (post_start + j);
            PUSH_GETLOCAL(args, *location, idx, depth);
        }
 
        if (local_body->param.flags.has_rest) {
            // argc remains unchanged from rest branch
            PUSH_INSN1(args, *location, newarray, INT2FIX(j));
            PUSH_INSN(args, *location, concatarray);
        }
        else {
            argc = post_len + post_start;
        }
    }
 
    const struct rb_iseq_param_keyword *const local_keyword = local_body->param.keyword;
    if (local_body->param.flags.has_kw) {
        int local_size = local_body->local_table_size;
        argc++;
 
        PUSH_INSN1(args, *location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
        if (local_body->param.flags.has_kwrest) {
            int idx = local_body->local_table_size - local_keyword->rest_start;
            PUSH_GETLOCAL(args, *location, idx, depth);
            RUBY_ASSERT(local_keyword->num > 0);
            PUSH_SEND(args, *location, rb_intern("dup"), INT2FIX(0));
        }
        else {
            PUSH_INSN1(args, *location, newhash, INT2FIX(0));
        }
        int i = 0;
        for (; i < local_keyword->num; ++i) {
            ID id = local_keyword->table[i];
            int idx = local_size - get_local_var_idx(local_iseq, id);
 
            {
                VALUE operand = ID2SYM(id);
                PUSH_INSN1(args, *location, putobject, operand);
            }
 
            PUSH_GETLOCAL(args, *location, idx, depth);
        }
 
        PUSH_SEND(args, *location, id_core_hash_merge_ptr, INT2FIX(i * 2 + 1));
        flag |= VM_CALL_KW_SPLAT| VM_CALL_KW_SPLAT_MUT;
    }
    else if (local_body->param.flags.has_kwrest) {
        int idx = local_body->local_table_size - local_keyword->rest_start;
        PUSH_GETLOCAL(args, *location, idx, depth);
        argc++;
        flag |= VM_CALL_KW_SPLAT;
    }
 
    PUSH_SEQ(ret, args);
 
    {
        const struct rb_callinfo *callinfo = new_callinfo(iseq, 0, argc, flag, NULL, block != NULL);
        PUSH_INSN2(ret, *location, invokesuper, callinfo, block);
    }
 
    if (node->block != NULL) {
        pm_compile_retry_end_label(iseq, ret, retry_end_l);
        PUSH_CATCH_ENTRY(CATCH_TYPE_BREAK, retry_label, retry_end_l, block, retry_end_l);
        ISEQ_COMPILE_DATA(iseq)->current_block = previous_block;
    }
 
    if (popped) PUSH_INSN(ret, *location, pop);
}
 
static inline void
pm_compile_match_required_node(rb_iseq_t *iseq, const pm_match_required_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    LABEL *matched_label = NEW_LABEL(location->line);
    LABEL *unmatched_label = NEW_LABEL(location->line);
    LABEL *done_label = NEW_LABEL(location->line);
 
    // First, we're going to push a bunch of stuff onto the stack that is
    // going to serve as our scratch space.
    PUSH_INSN(ret, *location, putnil); // key error key
    PUSH_INSN(ret, *location, putnil); // key error matchee
    PUSH_INSN1(ret, *location, putobject, Qfalse); // key error?
    PUSH_INSN(ret, *location, putnil); // error string
    PUSH_INSN(ret, *location, putnil); // deconstruct cache
 
    // Next we're going to compile the value expression such that it's on
    // the stack.
    PM_COMPILE_NOT_POPPED(node->value);
 
    // Here we'll dup it so that it can be used for comparison, but also be
    // used for error handling.
    PUSH_INSN(ret, *location, dup);
 
    // Next we'll compile the pattern. We indicate to the pm_compile_pattern
    // function that this is the only pattern that will be matched against
    // through the in_single_pattern parameter. We also indicate that the
    // value to compare against is 2 slots from the top of the stack (the
    // base_index parameter).
    pm_compile_pattern(iseq, scope_node, node->pattern, ret, matched_label, unmatched_label, true, true, 2);
 
    // If the pattern did not match the value, then we're going to compile
    // in our error handler code. This will determine which error to raise
    // and raise it.
    PUSH_LABEL(ret, unmatched_label);
    pm_compile_pattern_error_handler(iseq, scope_node, (const pm_node_t *) node, ret, done_label, popped);
 
    // If the pattern did match, we'll clean up the values we've pushed onto
    // the stack and then push nil onto the stack if it's not popped.
    PUSH_LABEL(ret, matched_label);
    PUSH_INSN1(ret, *location, adjuststack, INT2FIX(6));
    if (!popped) PUSH_INSN(ret, *location, putnil);
    PUSH_INSNL(ret, *location, jump, done_label);
 
    PUSH_LABEL(ret, done_label);
}
 
static inline void
pm_compile_match_write_node(rb_iseq_t *iseq, const pm_match_write_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    LABEL *fail_label = NEW_LABEL(location->line);
    LABEL *end_label = NEW_LABEL(location->line);
 
    // First, we'll compile the call so that all of its instructions are
    // present. Then we'll compile all of the local variable targets.
    PM_COMPILE_NOT_POPPED((const pm_node_t *) node->call);
 
    // Now, check if the match was successful. If it was, then we'll
    // continue on and assign local variables. Otherwise we'll skip over the
    // assignment code.
    {
        VALUE operand = rb_id2sym(idBACKREF);
        PUSH_INSN1(ret, *location, getglobal, operand);
    }
 
    PUSH_INSN(ret, *location, dup);
    PUSH_INSNL(ret, *location, branchunless, fail_label);
 
    // If there's only a single local variable target, we can skip some of
    // the bookkeeping, so we'll put a special branch here.
    size_t targets_count = node->targets.size;
 
    if (targets_count == 1) {
        const pm_node_t *target = node->targets.nodes[0];
        RUBY_ASSERT(PM_NODE_TYPE_P(target, PM_LOCAL_VARIABLE_TARGET_NODE));
 
        const pm_local_variable_target_node_t *local_target = (const pm_local_variable_target_node_t *) target;
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, local_target->name, local_target->depth);
 
        {
            VALUE operand = rb_id2sym(pm_constant_id_lookup(scope_node, local_target->name));
            PUSH_INSN1(ret, *location, putobject, operand);
        }
 
        PUSH_SEND(ret, *location, idAREF, INT2FIX(1));
        PUSH_LABEL(ret, fail_label);
        PUSH_SETLOCAL(ret, *location, index.index, index.level);
        if (popped) PUSH_INSN(ret, *location, pop);
        return;
    }
 
    DECL_ANCHOR(fail_anchor);
 
    // Otherwise there is more than one local variable target, so we'll need
    // to do some bookkeeping.
    for (size_t targets_index = 0; targets_index < targets_count; targets_index++) {
        const pm_node_t *target = node->targets.nodes[targets_index];
        RUBY_ASSERT(PM_NODE_TYPE_P(target, PM_LOCAL_VARIABLE_TARGET_NODE));
 
        const pm_local_variable_target_node_t *local_target = (const pm_local_variable_target_node_t *) target;
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, local_target->name, local_target->depth);
 
        if (((size_t) targets_index) < (targets_count - 1)) {
            PUSH_INSN(ret, *location, dup);
        }
 
        {
            VALUE operand = rb_id2sym(pm_constant_id_lookup(scope_node, local_target->name));
            PUSH_INSN1(ret, *location, putobject, operand);
        }
 
        PUSH_SEND(ret, *location, idAREF, INT2FIX(1));
        PUSH_SETLOCAL(ret, *location, index.index, index.level);
 
        PUSH_INSN(fail_anchor, *location, putnil);
        PUSH_SETLOCAL(fail_anchor, *location, index.index, index.level);
    }
 
    // Since we matched successfully, now we'll jump to the end.
    PUSH_INSNL(ret, *location, jump, end_label);
 
    // In the case that the match failed, we'll loop through each local
    // variable target and set all of them to `nil`.
    PUSH_LABEL(ret, fail_label);
    PUSH_INSN(ret, *location, pop);
    PUSH_SEQ(ret, fail_anchor);
 
    // Finally, we can push the end label for either case.
    PUSH_LABEL(ret, end_label);
    if (popped) PUSH_INSN(ret, *location, pop);
}
 
static inline void
pm_compile_next_node(rb_iseq_t *iseq, const pm_next_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    if (ISEQ_COMPILE_DATA(iseq)->redo_label != 0 && can_add_ensure_iseq(iseq)) {
        LABEL *splabel = NEW_LABEL(0);
        PUSH_LABEL(ret, splabel);
 
        if (node->arguments) {
            PM_COMPILE_NOT_POPPED((const pm_node_t *) node->arguments);
        }
        else {
            PUSH_INSN(ret, *location, putnil);
        }
        pm_add_ensure_iseq(ret, iseq, 0, scope_node);
 
        PUSH_ADJUST(ret, *location, ISEQ_COMPILE_DATA(iseq)->redo_label);
        PUSH_INSNL(ret, *location, jump, ISEQ_COMPILE_DATA(iseq)->start_label);
 
        PUSH_ADJUST_RESTORE(ret, splabel);
        if (!popped) PUSH_INSN(ret, *location, putnil);
    }
    else if (ISEQ_COMPILE_DATA(iseq)->end_label && can_add_ensure_iseq(iseq)) {
        LABEL *splabel = NEW_LABEL(0);
 
        PUSH_LABEL(ret, splabel);
        PUSH_ADJUST(ret, *location, ISEQ_COMPILE_DATA(iseq)->start_label);
 
        if (node->arguments != NULL) {
            PM_COMPILE_NOT_POPPED((const pm_node_t *) node->arguments);
        }
        else {
            PUSH_INSN(ret, *location, putnil);
        }
 
        pm_add_ensure_iseq(ret, iseq, 0, scope_node);
        PUSH_INSNL(ret, *location, jump, ISEQ_COMPILE_DATA(iseq)->end_label);
        PUSH_ADJUST_RESTORE(ret, splabel);
        splabel->unremovable = FALSE;
 
        if (!popped) PUSH_INSN(ret, *location, putnil);
    }
    else {
        const rb_iseq_t *ip = iseq;
        unsigned long throw_flag = 0;
 
        while (ip) {
            if (!ISEQ_COMPILE_DATA(ip)) {
                ip = 0;
                break;
            }
 
            throw_flag = VM_THROW_NO_ESCAPE_FLAG;
            if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
                /* while loop */
                break;
            }
            else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_BLOCK) {
                break;
            }
            else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_EVAL) {
                COMPILE_ERROR(iseq, location->line, "Invalid next");
                return;
            }
 
            ip = ISEQ_BODY(ip)->parent_iseq;
        }
 
        if (ip != 0) {
            if (node->arguments) {
                PM_COMPILE_NOT_POPPED((const pm_node_t *) node->arguments);
            }
            else {
                PUSH_INSN(ret, *location, putnil);
            }
 
            PUSH_INSN1(ret, *location, throw, INT2FIX(throw_flag | TAG_NEXT));
            if (popped) PUSH_INSN(ret, *location, pop);
        }
        else {
            COMPILE_ERROR(iseq, location->line, "Invalid next");
        }
    }
}
 
static inline void
pm_compile_redo_node(rb_iseq_t *iseq, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    if (ISEQ_COMPILE_DATA(iseq)->redo_label && can_add_ensure_iseq(iseq)) {
        LABEL *splabel = NEW_LABEL(0);
 
        PUSH_LABEL(ret, splabel);
        PUSH_ADJUST(ret, *location, ISEQ_COMPILE_DATA(iseq)->redo_label);
        pm_add_ensure_iseq(ret, iseq, 0, scope_node);
 
        PUSH_INSNL(ret, *location, jump, ISEQ_COMPILE_DATA(iseq)->redo_label);
        PUSH_ADJUST_RESTORE(ret, splabel);
        if (!popped) PUSH_INSN(ret, *location, putnil);
    }
    else if (ISEQ_BODY(iseq)->type != ISEQ_TYPE_EVAL && ISEQ_COMPILE_DATA(iseq)->start_label && can_add_ensure_iseq(iseq)) {
        LABEL *splabel = NEW_LABEL(0);
 
        PUSH_LABEL(ret, splabel);
        pm_add_ensure_iseq(ret, iseq, 0, scope_node);
        PUSH_ADJUST(ret, *location, ISEQ_COMPILE_DATA(iseq)->start_label);
 
        PUSH_INSNL(ret, *location, jump, ISEQ_COMPILE_DATA(iseq)->start_label);
        PUSH_ADJUST_RESTORE(ret, splabel);
        if (!popped) PUSH_INSN(ret, *location, putnil);
    }
    else {
        const rb_iseq_t *ip = iseq;
 
        while (ip) {
            if (!ISEQ_COMPILE_DATA(ip)) {
                ip = 0;
                break;
            }
 
            if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
                break;
            }
            else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_BLOCK) {
                break;
            }
            else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_EVAL) {
                COMPILE_ERROR(iseq, location->line, "Invalid redo");
                return;
            }
 
            ip = ISEQ_BODY(ip)->parent_iseq;
        }
 
        if (ip != 0) {
            PUSH_INSN(ret, *location, putnil);
            PUSH_INSN1(ret, *location, throw, INT2FIX(VM_THROW_NO_ESCAPE_FLAG | TAG_REDO));
            if (popped) PUSH_INSN(ret, *location, pop);
        }
        else {
            COMPILE_ERROR(iseq, location->line, "Invalid redo");
        }
    }
}
 
static inline void
pm_compile_rescue_node(rb_iseq_t *iseq, const pm_rescue_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    iseq_set_exception_local_table(iseq);
 
    // First, establish the labels that we need to be able to jump to within
    // this compilation block.
    LABEL *exception_match_label = NEW_LABEL(location->line);
    LABEL *rescue_end_label = NEW_LABEL(location->line);
 
    // Next, compile each of the exceptions that we're going to be
    // handling. For each one, we'll add instructions to check if the
    // exception matches the raised one, and if it does then jump to the
    // exception_match_label label. Otherwise it will fall through to the
    // subsequent check. If there are no exceptions, we'll only check
    // StandardError.
    const pm_node_list_t *exceptions = &node->exceptions;
 
    if (exceptions->size > 0) {
        for (size_t index = 0; index < exceptions->size; index++) {
            PUSH_GETLOCAL(ret, *location, LVAR_ERRINFO, 0);
            PM_COMPILE(exceptions->nodes[index]);
            int checkmatch_flags = VM_CHECKMATCH_TYPE_RESCUE;
            if (PM_NODE_TYPE_P(exceptions->nodes[index], PM_SPLAT_NODE)) {
                checkmatch_flags |= VM_CHECKMATCH_ARRAY;
            }
            PUSH_INSN1(ret, *location, checkmatch, INT2FIX(checkmatch_flags));
            PUSH_INSNL(ret, *location, branchif, exception_match_label);
        }
    }
    else {
        PUSH_GETLOCAL(ret, *location, LVAR_ERRINFO, 0);
        PUSH_INSN1(ret, *location, putobject, rb_eStandardError);
        PUSH_INSN1(ret, *location, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE));
        PUSH_INSNL(ret, *location, branchif, exception_match_label);
    }
 
    // If none of the exceptions that we are matching against matched, then
    // we'll jump straight to the rescue_end_label label.
    PUSH_INSNL(ret, *location, jump, rescue_end_label);
 
    // Here we have the exception_match_label, which is where the
    // control-flow goes in the case that one of the exceptions matched.
    // Here we will compile the instructions to handle the exception.
    PUSH_LABEL(ret, exception_match_label);
    PUSH_TRACE(ret, RUBY_EVENT_RESCUE);
 
    // If we have a reference to the exception, then we'll compile the write
    // into the instruction sequence. This can look quite different
    // depending on the kind of write being performed.
    if (node->reference) {
        DECL_ANCHOR(writes);
        DECL_ANCHOR(cleanup);
 
        pm_compile_target_node(iseq, node->reference, ret, writes, cleanup, scope_node, NULL);
        PUSH_GETLOCAL(ret, *location, LVAR_ERRINFO, 0);
 
        PUSH_SEQ(ret, writes);
        PUSH_SEQ(ret, cleanup);
    }
 
    // If we have statements to execute, we'll compile them here. Otherwise
    // we'll push nil onto the stack.
    if (node->statements != NULL) {
        // We'll temporarily remove the end_label location from the iseq
        // when compiling the statements so that next/redo statements
        // inside the body will throw to the correct place instead of
        // jumping straight to the end of this iseq
        LABEL *prev_end = ISEQ_COMPILE_DATA(iseq)->end_label;
        ISEQ_COMPILE_DATA(iseq)->end_label = NULL;
 
        PM_COMPILE((const pm_node_t *) node->statements);
 
        // Now restore the end_label
        ISEQ_COMPILE_DATA(iseq)->end_label = prev_end;
    }
    else {
        PUSH_INSN(ret, *location, putnil);
    }
 
    PUSH_INSN(ret, *location, leave);
 
    // Here we'll insert the rescue_end_label label, which is jumped to if
    // none of the exceptions matched. It will cause the control-flow to
    // either jump to the next rescue clause or it will fall through to the
    // subsequent instruction returning the raised error.
    PUSH_LABEL(ret, rescue_end_label);
    if (node->subsequent != NULL) {
        PM_COMPILE((const pm_node_t *) node->subsequent);
    }
    else {
        PUSH_GETLOCAL(ret, *location, 1, 0);
    }
}
 
static inline void
pm_compile_return_node(rb_iseq_t *iseq, const pm_return_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_arguments_node_t *arguments = node->arguments;
    enum rb_iseq_type type = ISEQ_BODY(iseq)->type;
    LABEL *splabel = 0;
 
    const rb_iseq_t *parent_iseq = iseq;
    enum rb_iseq_type parent_type = ISEQ_BODY(parent_iseq)->type;
    while (parent_type == ISEQ_TYPE_RESCUE || parent_type == ISEQ_TYPE_ENSURE) {
        if (!(parent_iseq = ISEQ_BODY(parent_iseq)->parent_iseq)) break;
        parent_type = ISEQ_BODY(parent_iseq)->type;
    }
 
    switch (parent_type) {
      case ISEQ_TYPE_TOP:
      case ISEQ_TYPE_MAIN:
        if (arguments) {
            rb_warn("argument of top-level return is ignored");
        }
        if (parent_iseq == iseq) {
            type = ISEQ_TYPE_METHOD;
        }
        break;
      default:
        break;
    }
 
    if (type == ISEQ_TYPE_METHOD) {
        splabel = NEW_LABEL(0);
        PUSH_LABEL(ret, splabel);
        PUSH_ADJUST(ret, *location, 0);
    }
 
    if (arguments != NULL) {
        PM_COMPILE_NOT_POPPED((const pm_node_t *) arguments);
    }
    else {
        PUSH_INSN(ret, *location, putnil);
    }
 
    if (type == ISEQ_TYPE_METHOD && can_add_ensure_iseq(iseq)) {
        pm_add_ensure_iseq(ret, iseq, 1, scope_node);
        PUSH_TRACE(ret, RUBY_EVENT_RETURN);
        PUSH_INSN(ret, *location, leave);
        PUSH_ADJUST_RESTORE(ret, splabel);
        if (!popped) PUSH_INSN(ret, *location, putnil);
    }
    else {
        PUSH_INSN1(ret, *location, throw, INT2FIX(TAG_RETURN));
        if (popped) PUSH_INSN(ret, *location, pop);
    }
}
 
static inline void
pm_compile_super_node(rb_iseq_t *iseq, const pm_super_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    DECL_ANCHOR(args);
 
    LABEL *retry_label = NEW_LABEL(location->line);
    LABEL *retry_end_l = NEW_LABEL(location->line);
 
    const rb_iseq_t *previous_block = ISEQ_COMPILE_DATA(iseq)->current_block;
    const rb_iseq_t *current_block;
    ISEQ_COMPILE_DATA(iseq)->current_block = current_block = NULL;
 
    PUSH_LABEL(ret, retry_label);
    PUSH_INSN(ret, *location, putself);
 
    int flags = 0;
    struct rb_callinfo_kwarg *keywords = NULL;
    int argc = pm_setup_args(node->arguments, node->block, &flags, &keywords, iseq, ret, scope_node, location);
    bool is_forwardable = (node->arguments != NULL) && PM_NODE_FLAG_P(node->arguments, PM_ARGUMENTS_NODE_FLAGS_CONTAINS_FORWARDING);
    flags |= VM_CALL_SUPER | VM_CALL_FCALL;
 
    if (node->block && PM_NODE_TYPE_P(node->block, PM_BLOCK_NODE)) {
        pm_scope_node_t next_scope_node;
        pm_scope_node_init(node->block, &next_scope_node, scope_node);
 
        ISEQ_COMPILE_DATA(iseq)->current_block = current_block = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, location->line);
        pm_scope_node_destroy(&next_scope_node);
    }
 
    if (!node->block) {
        iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
    }
 
    if ((flags & VM_CALL_ARGS_BLOCKARG) && (flags & VM_CALL_KW_SPLAT) && !(flags & VM_CALL_KW_SPLAT_MUT)) {
        PUSH_INSN(args, *location, splatkw);
    }
 
    PUSH_SEQ(ret, args);
    if (is_forwardable && ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->param.flags.forwardable) {
        flags |= VM_CALL_FORWARDING;
 
        {
            const struct rb_callinfo *callinfo = new_callinfo(iseq, 0, argc, flags, keywords, current_block != NULL);
            PUSH_INSN2(ret, *location, invokesuperforward, callinfo, current_block);
        }
    }
    else {
        {
            const struct rb_callinfo *callinfo = new_callinfo(iseq, 0, argc, flags, keywords, current_block != NULL);
            PUSH_INSN2(ret, *location, invokesuper, callinfo, current_block);
        }
 
    }
 
    pm_compile_retry_end_label(iseq, ret, retry_end_l);
 
    if (popped) PUSH_INSN(ret, *location, pop);
    ISEQ_COMPILE_DATA(iseq)->current_block = previous_block;
    PUSH_CATCH_ENTRY(CATCH_TYPE_BREAK, retry_label, retry_end_l, current_block, retry_end_l);
}
 
static inline void
pm_compile_yield_node(rb_iseq_t *iseq, const pm_yield_node_t *node, const pm_node_location_t *location, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    switch (ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->type) {
      case ISEQ_TYPE_TOP:
      case ISEQ_TYPE_MAIN:
      case ISEQ_TYPE_CLASS:
        COMPILE_ERROR(iseq, location->line, "Invalid yield");
        return;
      default: /* valid */;
    }
 
    int argc = 0;
    int flags = 0;
    struct rb_callinfo_kwarg *keywords = NULL;
 
    if (node->arguments) {
        argc = pm_setup_args(node->arguments, NULL, &flags, &keywords, iseq, ret, scope_node, location);
    }
 
    const struct rb_callinfo *callinfo = new_callinfo(iseq, 0, argc, flags, keywords, FALSE);
    PUSH_INSN1(ret, *location, invokeblock, callinfo);
 
    iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
    if (popped) PUSH_INSN(ret, *location, pop);
 
    int level = 0;
    for (const rb_iseq_t *tmp_iseq = iseq; tmp_iseq != ISEQ_BODY(iseq)->local_iseq; level++) {
        tmp_iseq = ISEQ_BODY(tmp_iseq)->parent_iseq;
    }
 
    if (level > 0) access_outer_variables(iseq, level, rb_intern("yield"), true);
}
 
static void
pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret, bool popped, pm_scope_node_t *scope_node)
{
    const pm_node_location_t location = PM_NODE_START_LOCATION(node);
    int lineno = (int) location.line;
 
    if (PM_NODE_TYPE_P(node, PM_BEGIN_NODE) && (((const pm_begin_node_t *) node)->statements == NULL) && (((const pm_begin_node_t *) node)->rescue_clause != NULL)) {
        // If this node is a begin node and it has empty statements and also
        // has a rescue clause, then the other parser considers it as
        // starting on the same line as the rescue, as opposed to the
        // location of the begin keyword. We replicate that behavior here.
        lineno = (int) PM_NODE_START_LINE_COLUMN(((const pm_begin_node_t *) node)->rescue_clause).line;
    }
 
    if (PM_NODE_FLAG_P(node, PM_NODE_FLAG_NEWLINE) && ISEQ_COMPILE_DATA(iseq)->last_line != lineno) {
        // If this node has the newline flag set and it is on a new line
        // from the previous nodes that have been compiled for this ISEQ,
        // then we need to emit a newline event.
        int event = RUBY_EVENT_LINE;
 
        ISEQ_COMPILE_DATA(iseq)->last_line = lineno;
        if (lineno > 0 && ISEQ_COVERAGE(iseq) && ISEQ_LINE_COVERAGE(iseq)) {
            event |= RUBY_EVENT_COVERAGE_LINE;
        }
        PUSH_TRACE(ret, event);
    }
 
    switch (PM_NODE_TYPE(node)) {
      case PM_ALIAS_GLOBAL_VARIABLE_NODE:
        // alias $foo $bar
        // ^^^^^^^^^^^^^^^
        pm_compile_alias_global_variable_node(iseq, (const pm_alias_global_variable_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_ALIAS_METHOD_NODE:
        // alias foo bar
        // ^^^^^^^^^^^^^
        pm_compile_alias_method_node(iseq, (const pm_alias_method_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_AND_NODE:
        // a and b
        // ^^^^^^^
        pm_compile_and_node(iseq, (const pm_and_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_ARGUMENTS_NODE: {
        // break foo
        //       ^^^
        //
        // These are ArgumentsNodes that are not compiled directly by their
        // parent call nodes, used in the cases of NextNodes, ReturnNodes, and
        // BreakNodes. They can create an array like ArrayNode.
        const pm_arguments_node_t *cast = (const pm_arguments_node_t *) node;
        const pm_node_list_t *elements = &cast->arguments;
 
        if (elements->size == 1) {
            // If we are only returning a single element through one of the jump
            // nodes, then we will only compile that node directly.
            PM_COMPILE(elements->nodes[0]);
        }
        else {
            pm_compile_array_node(iseq, (const pm_node_t *) cast, elements, &location, ret, popped, scope_node);
        }
        return;
      }
      case PM_ARRAY_NODE: {
        // [foo, bar, baz]
        // ^^^^^^^^^^^^^^^
        const pm_array_node_t *cast = (const pm_array_node_t *) node;
        pm_compile_array_node(iseq, (const pm_node_t *) cast, &cast->elements, &location, ret, popped, scope_node);
        return;
      }
      case PM_ASSOC_NODE: {
        // { foo: 1 }
        //   ^^^^^^
        //
        // foo(bar: 1)
        //     ^^^^^^
        const pm_assoc_node_t *cast = (const pm_assoc_node_t *) node;
 
        PM_COMPILE(cast->key);
        PM_COMPILE(cast->value);
 
        return;
      }
      case PM_ASSOC_SPLAT_NODE: {
        // { **foo }
        //   ^^^^^
        //
        // def foo(**); bar(**); end
        //                  ^^
        const pm_assoc_splat_node_t *cast = (const pm_assoc_splat_node_t *) node;
 
        if (cast->value != NULL) {
            PM_COMPILE(cast->value);
        }
        else if (!popped) {
            pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_POW, 0);
            PUSH_GETLOCAL(ret, location, index.index, index.level);
        }
 
        return;
      }
      case PM_BACK_REFERENCE_READ_NODE: {
        // $+
        // ^^
        if (!popped) {
            const pm_back_reference_read_node_t *cast = (const pm_back_reference_read_node_t *) node;
            VALUE backref = pm_compile_back_reference_ref(scope_node, cast);
 
            PUSH_INSN2(ret, location, getspecial, INT2FIX(1), backref);
        }
        return;
      }
      case PM_BEGIN_NODE: {
        // begin end
        // ^^^^^^^^^
        const pm_begin_node_t *cast = (const pm_begin_node_t *) node;
 
        if (cast->ensure_clause) {
            // Compiling the ensure clause will compile the rescue clause (if
            // there is one), which will compile the begin statements.
            pm_compile_ensure(iseq, cast, &location, ret, popped, scope_node);
        }
        else if (cast->rescue_clause) {
            // Compiling rescue will compile begin statements (if applicable).
            pm_compile_rescue(iseq, cast, &location, ret, popped, scope_node);
        }
        else {
            // If there is neither ensure or rescue, the just compile the
            // statements.
            if (cast->statements != NULL) {
                PM_COMPILE((const pm_node_t *) cast->statements);
            }
            else if (!popped) {
                PUSH_SYNTHETIC_PUTNIL(ret, iseq);
            }
        }
        return;
      }
      case PM_BLOCK_ARGUMENT_NODE: {
        // foo(&bar)
        //     ^^^^
        const pm_block_argument_node_t *cast = (const pm_block_argument_node_t *) node;
 
        if (cast->expression != NULL) {
            PM_COMPILE(cast->expression);
        }
        else {
            // If there's no expression, this must be block forwarding.
            pm_local_index_t local_index = pm_lookup_local_index(iseq, scope_node, PM_CONSTANT_AND, 0);
            PUSH_INSN2(ret, location, getblockparamproxy, INT2FIX(local_index.index + VM_ENV_DATA_SIZE - 1), INT2FIX(local_index.level));
        }
        return;
      }
      case PM_BREAK_NODE:
        // break
        // ^^^^^
        //
        // break foo
        // ^^^^^^^^^
        pm_compile_break_node(iseq, (const pm_break_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_CALL_NODE:
        // foo
        // ^^^
        //
        // foo.bar
        // ^^^^^^^
        //
        // foo.bar() {}
        // ^^^^^^^^^^^^
        pm_compile_call_node(iseq, (const pm_call_node_t *) node, ret, popped, scope_node);
        return;
      case PM_CALL_AND_WRITE_NODE: {
        // foo.bar &&= baz
        // ^^^^^^^^^^^^^^^
        const pm_call_and_write_node_t *cast = (const pm_call_and_write_node_t *) node;
        pm_compile_call_and_or_write_node(iseq, true, cast->receiver, cast->value, cast->write_name, cast->read_name, PM_NODE_FLAG_P(cast, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION), &location, ret, popped, scope_node);
        return;
      }
      case PM_CALL_OR_WRITE_NODE: {
        // foo.bar ||= baz
        // ^^^^^^^^^^^^^^^
        const pm_call_or_write_node_t *cast = (const pm_call_or_write_node_t *) node;
        pm_compile_call_and_or_write_node(iseq, false, cast->receiver, cast->value, cast->write_name, cast->read_name, PM_NODE_FLAG_P(cast, PM_CALL_NODE_FLAGS_SAFE_NAVIGATION), &location, ret, popped, scope_node);
        return;
      }
      case PM_CALL_OPERATOR_WRITE_NODE:
        // foo.bar += baz
        // ^^^^^^^^^^^^^^^
        //
        // Call operator writes occur when you have a call node on the left-hand
        // side of a write operator that is not `=`. As an example,
        // `foo.bar *= 1`. This breaks down to caching the receiver on the
        // stack and then performing three method calls, one to read the value,
        // one to compute the result, and one to write the result back to the
        // receiver.
        pm_compile_call_operator_write_node(iseq, (const pm_call_operator_write_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_CASE_NODE:
        // case foo; when bar; end
        // ^^^^^^^^^^^^^^^^^^^^^^^
        pm_compile_case_node(iseq, (const pm_case_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_CASE_MATCH_NODE:
        // case foo; in bar; end
        // ^^^^^^^^^^^^^^^^^^^^^
        //
        // If you use the `case` keyword to create a case match node, it will
        // match against all of the `in` clauses until it finds one that
        // matches. If it doesn't find one, it can optionally fall back to an
        // `else` clause. If none is present and a match wasn't found, it will
        // raise an appropriate error.
        pm_compile_case_match_node(iseq, (const pm_case_match_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_CLASS_NODE: {
        // class Foo; end
        // ^^^^^^^^^^^^^^
        const pm_class_node_t *cast = (const pm_class_node_t *) node;
 
        ID class_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE class_name = rb_str_freeze(rb_sprintf("<class:%"PRIsVALUE">", rb_id2str(class_id)));
 
        pm_scope_node_t next_scope_node;
        pm_scope_node_init((const pm_node_t *) cast, &next_scope_node, scope_node);
 
        const rb_iseq_t *class_iseq = NEW_CHILD_ISEQ(&next_scope_node, class_name, ISEQ_TYPE_CLASS, location.line);
        pm_scope_node_destroy(&next_scope_node);
 
        // TODO: Once we merge constant path nodes correctly, fix this flag
        const int flags = VM_DEFINECLASS_TYPE_CLASS |
            (cast->superclass ? VM_DEFINECLASS_FLAG_HAS_SUPERCLASS : 0) |
            pm_compile_class_path(iseq, cast->constant_path, &location, ret, false, scope_node);
 
        if (cast->superclass) {
            PM_COMPILE_NOT_POPPED(cast->superclass);
        }
        else {
            PUSH_INSN(ret, location, putnil);
        }
 
        {
            VALUE operand = ID2SYM(class_id);
            PUSH_INSN3(ret, location, defineclass, operand, class_iseq, INT2FIX(flags));
        }
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)class_iseq);
 
        if (popped) PUSH_INSN(ret, location, pop);
        return;
      }
      case PM_CLASS_VARIABLE_AND_WRITE_NODE: {
        // @@foo &&= bar
        // ^^^^^^^^^^^^^
        const pm_class_variable_and_write_node_t *cast = (const pm_class_variable_and_write_node_t *) node;
        LABEL *end_label = NEW_LABEL(location.line);
 
        ID name_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE name = ID2SYM(name_id);
 
        PUSH_INSN2(ret, location, getclassvariable, name, get_cvar_ic_value(iseq, name_id));
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchunless, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSN2(ret, location, setclassvariable, name, get_cvar_ic_value(iseq, name_id));
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_CLASS_VARIABLE_OPERATOR_WRITE_NODE: {
        // @@foo += bar
        // ^^^^^^^^^^^^
        const pm_class_variable_operator_write_node_t *cast = (const pm_class_variable_operator_write_node_t *) node;
 
        ID name_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE name = ID2SYM(name_id);
 
        PUSH_INSN2(ret, location, getclassvariable, name, get_cvar_ic_value(iseq, name_id));
        PM_COMPILE_NOT_POPPED(cast->value);
 
        ID method_id = pm_constant_id_lookup(scope_node, cast->binary_operator);
        int flags = VM_CALL_ARGS_SIMPLE;
        PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2NUM(1), INT2FIX(flags));
 
        if (!popped) PUSH_INSN(ret, location, dup);
        PUSH_INSN2(ret, location, setclassvariable, name, get_cvar_ic_value(iseq, name_id));
 
        return;
      }
      case PM_CLASS_VARIABLE_OR_WRITE_NODE: {
        // @@foo ||= bar
        // ^^^^^^^^^^^^^
        const pm_class_variable_or_write_node_t *cast = (const pm_class_variable_or_write_node_t *) node;
        LABEL *end_label = NEW_LABEL(location.line);
        LABEL *start_label = NEW_LABEL(location.line);
 
        ID name_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE name = ID2SYM(name_id);
 
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_CVAR), name, Qtrue);
        PUSH_INSNL(ret, location, branchunless, start_label);
 
        PUSH_INSN2(ret, location, getclassvariable, name, get_cvar_ic_value(iseq, name_id));
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchif, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, start_label);
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSN2(ret, location, setclassvariable, name, get_cvar_ic_value(iseq, name_id));
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_CLASS_VARIABLE_READ_NODE: {
        // @@foo
        // ^^^^^
        if (!popped) {
            const pm_class_variable_read_node_t *cast = (const pm_class_variable_read_node_t *) node;
            ID name = pm_constant_id_lookup(scope_node, cast->name);
            PUSH_INSN2(ret, location, getclassvariable, ID2SYM(name), get_cvar_ic_value(iseq, name));
        }
        return;
      }
      case PM_CLASS_VARIABLE_WRITE_NODE: {
        // @@foo = 1
        // ^^^^^^^^^
        const pm_class_variable_write_node_t *cast = (const pm_class_variable_write_node_t *) node;
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        ID name = pm_constant_id_lookup(scope_node, cast->name);
        PUSH_INSN2(ret, location, setclassvariable, ID2SYM(name), get_cvar_ic_value(iseq, name));
 
        return;
      }
      case PM_CONSTANT_PATH_NODE: {
        // Foo::Bar
        // ^^^^^^^^
        VALUE parts;
 
        if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache && ((parts = pm_constant_path_parts(node, scope_node)) != Qnil)) {
            ISEQ_BODY(iseq)->ic_size++;
            RB_OBJ_SET_SHAREABLE(parts);
            PUSH_INSN1(ret, location, opt_getconstant_path, parts);
        }
        else {
            DECL_ANCHOR(prefix);
            DECL_ANCHOR(body);
 
            pm_compile_constant_path(iseq, node, prefix, body, popped, scope_node);
            if (LIST_INSN_SIZE_ZERO(prefix)) {
                PUSH_INSN(ret, location, putnil);
            }
            else {
                PUSH_SEQ(ret, prefix);
            }
 
            PUSH_SEQ(ret, body);
        }
 
        if (popped) PUSH_INSN(ret, location, pop);
        return;
      }
      case PM_CONSTANT_PATH_AND_WRITE_NODE: {
        // Foo::Bar &&= baz
        // ^^^^^^^^^^^^^^^^
        const pm_constant_path_and_write_node_t *cast = (const pm_constant_path_and_write_node_t *) node;
        pm_compile_constant_path_and_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_PATH_OR_WRITE_NODE: {
        // Foo::Bar ||= baz
        // ^^^^^^^^^^^^^^^^
        const pm_constant_path_or_write_node_t *cast = (const pm_constant_path_or_write_node_t *) node;
        pm_compile_constant_path_or_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_PATH_OPERATOR_WRITE_NODE: {
        // Foo::Bar += baz
        // ^^^^^^^^^^^^^^^
        const pm_constant_path_operator_write_node_t *cast = (const pm_constant_path_operator_write_node_t *) node;
        pm_compile_constant_path_operator_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_PATH_WRITE_NODE: {
        // Foo::Bar = 1
        // ^^^^^^^^^^^^
        const pm_constant_path_write_node_t *cast = (const pm_constant_path_write_node_t *) node;
        pm_compile_constant_path_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_READ_NODE: {
        // Foo
        // ^^^
        const pm_constant_read_node_t *cast = (const pm_constant_read_node_t *) node;
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
        pm_compile_constant_read(iseq, name, &cast->base.location, location.node_id, ret, scope_node);
        if (popped) PUSH_INSN(ret, location, pop);
 
        return;
      }
      case PM_CONSTANT_AND_WRITE_NODE: {
        // Foo &&= bar
        // ^^^^^^^^^^^
        const pm_constant_and_write_node_t *cast = (const pm_constant_and_write_node_t *) node;
        pm_compile_constant_and_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_OR_WRITE_NODE: {
        // Foo ||= bar
        // ^^^^^^^^^^^
        const pm_constant_or_write_node_t *cast = (const pm_constant_or_write_node_t *) node;
        pm_compile_constant_or_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_OPERATOR_WRITE_NODE: {
        // Foo += bar
        // ^^^^^^^^^^
        const pm_constant_operator_write_node_t *cast = (const pm_constant_operator_write_node_t *) node;
        pm_compile_constant_operator_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_CONSTANT_WRITE_NODE: {
        // Foo = 1
        // ^^^^^^^
        const pm_constant_write_node_t *cast = (const pm_constant_write_node_t *) node;
        pm_compile_constant_write_node(iseq, cast, 0, &location, ret, popped, scope_node);
        return;
      }
      case PM_DEF_NODE: {
        // def foo; end
        // ^^^^^^^^^^^^
        //
        // def self.foo; end
        // ^^^^^^^^^^^^^^^^^
        const pm_def_node_t *cast = (const pm_def_node_t *) node;
        ID method_name = pm_constant_id_lookup(scope_node, cast->name);
 
        pm_scope_node_t next_scope_node;
        pm_scope_node_init((const pm_node_t *) cast, &next_scope_node, scope_node);
 
        rb_iseq_t *method_iseq = NEW_ISEQ(&next_scope_node, rb_id2str(method_name), ISEQ_TYPE_METHOD, location.line);
        pm_scope_node_destroy(&next_scope_node);
 
        if (cast->receiver) {
            PM_COMPILE_NOT_POPPED(cast->receiver);
            PUSH_INSN2(ret, location, definesmethod, ID2SYM(method_name), method_iseq);
        }
        else {
            PUSH_INSN2(ret, location, definemethod, ID2SYM(method_name), method_iseq);
        }
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE) method_iseq);
 
        if (!popped) {
            PUSH_INSN1(ret, location, putobject, ID2SYM(method_name));
        }
 
        return;
      }
      case PM_DEFINED_NODE: {
        // defined?(a)
        // ^^^^^^^^^^^
        const pm_defined_node_t *cast = (const pm_defined_node_t *) node;
        pm_compile_defined_expr(iseq, cast->value, &location, ret, popped, scope_node, false);
        return;
      }
      case PM_EMBEDDED_STATEMENTS_NODE: {
        // "foo #{bar}"
        //      ^^^^^^
        const pm_embedded_statements_node_t *cast = (const pm_embedded_statements_node_t *) node;
 
        if (cast->statements != NULL) {
            PM_COMPILE((const pm_node_t *) (cast->statements));
        }
        else {
            PUSH_SYNTHETIC_PUTNIL(ret, iseq);
        }
 
        if (popped) PUSH_INSN(ret, location, pop);
        return;
      }
      case PM_EMBEDDED_VARIABLE_NODE: {
        // "foo #@bar"
        //      ^^^^^
        const pm_embedded_variable_node_t *cast = (const pm_embedded_variable_node_t *) node;
        PM_COMPILE(cast->variable);
        return;
      }
      case PM_FALSE_NODE: {
        // false
        // ^^^^^
        if (!popped) {
            PUSH_INSN1(ret, location, putobject, Qfalse);
        }
        return;
      }
      case PM_ENSURE_NODE: {
        const pm_ensure_node_t *cast = (const pm_ensure_node_t *) node;
 
        if (cast->statements != NULL) {
            PM_COMPILE((const pm_node_t *) cast->statements);
        }
 
        return;
      }
      case PM_ELSE_NODE: {
        // if foo then bar else baz end
        //                 ^^^^^^^^^^^^
        const pm_else_node_t *cast = (const pm_else_node_t *) node;
 
        if (cast->statements != NULL) {
            PM_COMPILE((const pm_node_t *) cast->statements);
        }
        else if (!popped) {
            PUSH_SYNTHETIC_PUTNIL(ret, iseq);
        }
 
        return;
      }
      case PM_FLIP_FLOP_NODE: {
        // if foo .. bar; end
        //    ^^^^^^^^^^
        const pm_flip_flop_node_t *cast = (const pm_flip_flop_node_t *) node;
 
        LABEL *final_label = NEW_LABEL(location.line);
        LABEL *then_label = NEW_LABEL(location.line);
        LABEL *else_label = NEW_LABEL(location.line);
 
        pm_compile_flip_flop(cast, else_label, then_label, iseq, location.line, ret, popped, scope_node);
 
        PUSH_LABEL(ret, then_label);
        PUSH_INSN1(ret, location, putobject, Qtrue);
        PUSH_INSNL(ret, location, jump, final_label);
        PUSH_LABEL(ret, else_label);
        PUSH_INSN1(ret, location, putobject, Qfalse);
        PUSH_LABEL(ret, final_label);
 
        return;
      }
      case PM_FLOAT_NODE: {
        // 1.0
        // ^^^
        if (!popped) {
            VALUE operand = parse_float((const pm_float_node_t *) node);
            PUSH_INSN1(ret, location, putobject, operand);
        }
        return;
      }
      case PM_FOR_NODE: {
        // for foo in bar do end
        // ^^^^^^^^^^^^^^^^^^^^^
        const pm_for_node_t *cast = (const pm_for_node_t *) node;
 
        LABEL *retry_label = NEW_LABEL(location.line);
        LABEL *retry_end_l = NEW_LABEL(location.line);
 
        // First, compile the collection that we're going to be iterating over.
        PUSH_LABEL(ret, retry_label);
        PM_COMPILE_NOT_POPPED(cast->collection);
 
        // Next, create the new scope that is going to contain the block that
        // will be passed to the each method.
        pm_scope_node_t next_scope_node;
        pm_scope_node_init((const pm_node_t *) cast, &next_scope_node, scope_node);
 
        const rb_iseq_t *child_iseq = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, location.line);
        pm_scope_node_destroy(&next_scope_node);
 
        const rb_iseq_t *prev_block = ISEQ_COMPILE_DATA(iseq)->current_block;
        ISEQ_COMPILE_DATA(iseq)->current_block = child_iseq;
 
        // Now, create the method call to each that will be used to iterate over
        // the collection, and pass the newly created iseq as the block.
        PUSH_SEND_WITH_BLOCK(ret, location, idEach, INT2FIX(0), child_iseq);
        pm_compile_retry_end_label(iseq, ret, retry_end_l);
 
        if (popped) PUSH_INSN(ret, location, pop);
        ISEQ_COMPILE_DATA(iseq)->current_block = prev_block;
        PUSH_CATCH_ENTRY(CATCH_TYPE_BREAK, retry_label, retry_end_l, child_iseq, retry_end_l);
        return;
      }
      case PM_FORWARDING_ARGUMENTS_NODE:
        rb_bug("Cannot compile a ForwardingArgumentsNode directly\n");
        return;
      case PM_FORWARDING_SUPER_NODE:
        // super
        // ^^^^^
        //
        // super {}
        // ^^^^^^^^
        pm_compile_forwarding_super_node(iseq, (const pm_forwarding_super_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_GLOBAL_VARIABLE_AND_WRITE_NODE: {
        // $foo &&= bar
        // ^^^^^^^^^^^^
        const pm_global_variable_and_write_node_t *cast = (const pm_global_variable_and_write_node_t *) node;
        LABEL *end_label = NEW_LABEL(location.line);
 
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
        PUSH_INSN1(ret, location, getglobal, name);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchunless, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSN1(ret, location, setglobal, name);
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_GLOBAL_VARIABLE_OPERATOR_WRITE_NODE: {
        // $foo += bar
        // ^^^^^^^^^^^
        const pm_global_variable_operator_write_node_t *cast = (const pm_global_variable_operator_write_node_t *) node;
 
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
        PUSH_INSN1(ret, location, getglobal, name);
        PM_COMPILE_NOT_POPPED(cast->value);
 
        ID method_id = pm_constant_id_lookup(scope_node, cast->binary_operator);
        int flags = VM_CALL_ARGS_SIMPLE;
        PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2NUM(1), INT2FIX(flags));
 
        if (!popped) PUSH_INSN(ret, location, dup);
        PUSH_INSN1(ret, location, setglobal, name);
 
        return;
      }
      case PM_GLOBAL_VARIABLE_OR_WRITE_NODE: {
        // $foo ||= bar
        // ^^^^^^^^^^^^
        const pm_global_variable_or_write_node_t *cast = (const pm_global_variable_or_write_node_t *) node;
        LABEL *set_label = NEW_LABEL(location.line);
        LABEL *end_label = NEW_LABEL(location.line);
 
        PUSH_INSN(ret, location, putnil);
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
        PUSH_INSN3(ret, location, defined, INT2FIX(DEFINED_GVAR), name, Qtrue);
        PUSH_INSNL(ret, location, branchunless, set_label);
 
        PUSH_INSN1(ret, location, getglobal, name);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchif, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, set_label);
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSN1(ret, location, setglobal, name);
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_GLOBAL_VARIABLE_READ_NODE: {
        // $foo
        // ^^^^
        const pm_global_variable_read_node_t *cast = (const pm_global_variable_read_node_t *) node;
        VALUE name = ID2SYM(pm_constant_id_lookup(scope_node, cast->name));
 
        PUSH_INSN1(ret, location, getglobal, name);
        if (popped) PUSH_INSN(ret, location, pop);
 
        return;
      }
      case PM_GLOBAL_VARIABLE_WRITE_NODE: {
        // $foo = 1
        // ^^^^^^^^
        const pm_global_variable_write_node_t *cast = (const pm_global_variable_write_node_t *) node;
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        ID name = pm_constant_id_lookup(scope_node, cast->name);
        PUSH_INSN1(ret, location, setglobal, ID2SYM(name));
 
        return;
      }
      case PM_HASH_NODE: {
        // {}
        // ^^
        //
        // If every node in the hash is static, then we can compile the entire
        // hash now instead of later.
        if (PM_NODE_FLAG_P(node, PM_NODE_FLAG_STATIC_LITERAL)) {
            // We're only going to compile this node if it's not popped. If it
            // is popped, then we know we don't need to do anything since it's
            // statically known.
            if (!popped) {
                const pm_hash_node_t *cast = (const pm_hash_node_t *) node;
 
                if (cast->elements.size == 0) {
                    PUSH_INSN1(ret, location, newhash, INT2FIX(0));
                }
                else {
                    VALUE value = pm_static_literal_value(iseq, node, scope_node);
                    PUSH_INSN1(ret, location, duphash, value);
                    RB_OBJ_WRITTEN(iseq, Qundef, value);
                }
            }
        }
        else {
            // Here since we know there are possible side-effects inside the
            // hash contents, we're going to build it entirely at runtime. We'll
            // do this by pushing all of the key-value pairs onto the stack and
            // then combining them with newhash.
            //
            // If this hash is popped, then this serves only to ensure we enact
            // all side-effects (like method calls) that are contained within
            // the hash contents.
            const pm_hash_node_t *cast = (const pm_hash_node_t *) node;
            const pm_node_list_t *elements = &cast->elements;
 
            if (popped) {
                // If this hash is popped, then we can iterate through each
                // element and compile it. The result of each compilation will
                // only include the side effects of the element itself.
                for (size_t index = 0; index < elements->size; index++) {
                    PM_COMPILE_POPPED(elements->nodes[index]);
                }
            }
            else {
                pm_compile_hash_elements(iseq, node, elements, 0, Qundef, false, ret, scope_node);
            }
        }
 
        return;
      }
      case PM_IF_NODE: {
        // if foo then bar end
        // ^^^^^^^^^^^^^^^^^^^
        //
        // bar if foo
        // ^^^^^^^^^^
        //
        // foo ? bar : baz
        // ^^^^^^^^^^^^^^^
        const pm_if_node_t *cast = (const pm_if_node_t *) node;
        pm_compile_conditional(iseq, &location, PM_IF_NODE, (const pm_node_t *) cast, cast->statements, cast->subsequent, cast->predicate, ret, popped, scope_node);
        return;
      }
      case PM_IMAGINARY_NODE: {
        // 1i
        // ^^
        if (!popped) {
            VALUE operand = parse_imaginary((const pm_imaginary_node_t *) node);
            PUSH_INSN1(ret, location, putobject, operand);
        }
        return;
      }
      case PM_IMPLICIT_NODE: {
        // Implicit nodes mark places in the syntax tree where explicit syntax
        // was omitted, but implied. For example,
        //
        //     { foo: }
        //
        // In this case a method call/local variable read is implied by virtue
        // of the missing value. To compile these nodes, we simply compile the
        // value that is implied, which is helpfully supplied by the parser.
        const pm_implicit_node_t *cast = (const pm_implicit_node_t *) node;
        PM_COMPILE(cast->value);
        return;
      }
      case PM_IN_NODE: {
        // In nodes are handled by the case match node directly, so we should
        // never end up hitting them through this path.
        rb_bug("Should not ever enter an in node directly");
        return;
      }
      case PM_INDEX_OPERATOR_WRITE_NODE: {
        // foo[bar] += baz
        // ^^^^^^^^^^^^^^^
        const pm_index_operator_write_node_t *cast = (const pm_index_operator_write_node_t *) node;
        pm_compile_index_operator_write_node(iseq, cast, &location, ret, popped, scope_node);
        return;
      }
      case PM_INDEX_AND_WRITE_NODE: {
        // foo[bar] &&= baz
        // ^^^^^^^^^^^^^^^^
        const pm_index_and_write_node_t *cast = (const pm_index_and_write_node_t *) node;
        pm_compile_index_control_flow_write_node(iseq, node, cast->receiver, cast->arguments, cast->block, cast->value, &location, ret, popped, scope_node);
        return;
      }
      case PM_INDEX_OR_WRITE_NODE: {
        // foo[bar] ||= baz
        // ^^^^^^^^^^^^^^^^
        const pm_index_or_write_node_t *cast = (const pm_index_or_write_node_t *) node;
        pm_compile_index_control_flow_write_node(iseq, node, cast->receiver, cast->arguments, cast->block, cast->value, &location, ret, popped, scope_node);
        return;
      }
      case PM_INSTANCE_VARIABLE_AND_WRITE_NODE: {
        // @foo &&= bar
        // ^^^^^^^^^^^^
        const pm_instance_variable_and_write_node_t *cast = (const pm_instance_variable_and_write_node_t *) node;
        LABEL *end_label = NEW_LABEL(location.line);
 
        ID name_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE name = ID2SYM(name_id);
 
        PUSH_INSN2(ret, location, getinstancevariable, name, get_ivar_ic_value(iseq, name_id));
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchunless, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSN2(ret, location, setinstancevariable, name, get_ivar_ic_value(iseq, name_id));
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_INSTANCE_VARIABLE_OPERATOR_WRITE_NODE: {
        // @foo += bar
        // ^^^^^^^^^^^
        const pm_instance_variable_operator_write_node_t *cast = (const pm_instance_variable_operator_write_node_t *) node;
 
        ID name_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE name = ID2SYM(name_id);
 
        PUSH_INSN2(ret, location, getinstancevariable, name, get_ivar_ic_value(iseq, name_id));
        PM_COMPILE_NOT_POPPED(cast->value);
 
        ID method_id = pm_constant_id_lookup(scope_node, cast->binary_operator);
        int flags = VM_CALL_ARGS_SIMPLE;
        PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2NUM(1), INT2FIX(flags));
 
        if (!popped) PUSH_INSN(ret, location, dup);
        PUSH_INSN2(ret, location, setinstancevariable, name, get_ivar_ic_value(iseq, name_id));
 
        return;
      }
      case PM_INSTANCE_VARIABLE_OR_WRITE_NODE: {
        // @foo ||= bar
        // ^^^^^^^^^^^^
        const pm_instance_variable_or_write_node_t *cast = (const pm_instance_variable_or_write_node_t *) node;
        LABEL *end_label = NEW_LABEL(location.line);
 
        ID name_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE name = ID2SYM(name_id);
 
        PUSH_INSN2(ret, location, getinstancevariable, name, get_ivar_ic_value(iseq, name_id));
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchif, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSN2(ret, location, setinstancevariable, name, get_ivar_ic_value(iseq, name_id));
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_INSTANCE_VARIABLE_READ_NODE: {
        // @foo
        // ^^^^
        if (!popped) {
            const pm_instance_variable_read_node_t *cast = (const pm_instance_variable_read_node_t *) node;
            ID name = pm_constant_id_lookup(scope_node, cast->name);
            PUSH_INSN2(ret, location, getinstancevariable, ID2SYM(name), get_ivar_ic_value(iseq, name));
        }
        return;
      }
      case PM_INSTANCE_VARIABLE_WRITE_NODE: {
        // @foo = 1
        // ^^^^^^^^
        const pm_instance_variable_write_node_t *cast = (const pm_instance_variable_write_node_t *) node;
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        ID name = pm_constant_id_lookup(scope_node, cast->name);
        PUSH_INSN2(ret, location, setinstancevariable, ID2SYM(name), get_ivar_ic_value(iseq, name));
 
        return;
      }
      case PM_INTEGER_NODE: {
        // 1
        // ^
        if (!popped) {
            VALUE operand = parse_integer((const pm_integer_node_t *) node);
            PUSH_INSN1(ret, location, putobject, operand);
        }
        return;
      }
      case PM_INTERPOLATED_MATCH_LAST_LINE_NODE: {
        // if /foo #{bar}/ then end
        //    ^^^^^^^^^^^^
        if (PM_NODE_FLAG_P(node, PM_NODE_FLAG_STATIC_LITERAL)) {
            if (!popped) {
                VALUE regexp = pm_static_literal_value(iseq, node, scope_node);
                PUSH_INSN1(ret, location, putobject, regexp);
            }
        }
        else {
            pm_compile_regexp_dynamic(iseq, node, &((const pm_interpolated_match_last_line_node_t *) node)->parts, &location, ret, popped, scope_node);
        }
 
        PUSH_INSN1(ret, location, getglobal, rb_id2sym(idLASTLINE));
        PUSH_SEND(ret, location, idEqTilde, INT2NUM(1));
        if (popped) PUSH_INSN(ret, location, pop);
 
        return;
      }
      case PM_INTERPOLATED_REGULAR_EXPRESSION_NODE: {
        // /foo #{bar}/
        // ^^^^^^^^^^^^
        if (PM_NODE_FLAG_P(node, PM_REGULAR_EXPRESSION_FLAGS_ONCE)) {
            const rb_iseq_t *prevblock = ISEQ_COMPILE_DATA(iseq)->current_block;
            const rb_iseq_t *block_iseq = NULL;
            int ise_index = ISEQ_BODY(iseq)->ise_size++;
 
            pm_scope_node_t next_scope_node;
            pm_scope_node_init(node, &next_scope_node, scope_node);
 
            block_iseq = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_PLAIN, location.line);
            pm_scope_node_destroy(&next_scope_node);
 
            ISEQ_COMPILE_DATA(iseq)->current_block = block_iseq;
            PUSH_INSN2(ret, location, once, block_iseq, INT2FIX(ise_index));
            ISEQ_COMPILE_DATA(iseq)->current_block = prevblock;
 
            if (popped) PUSH_INSN(ret, location, pop);
            return;
        }
 
        if (PM_NODE_FLAG_P(node, PM_NODE_FLAG_STATIC_LITERAL)) {
            if (!popped) {
                VALUE regexp = pm_static_literal_value(iseq, node, scope_node);
                PUSH_INSN1(ret, location, putobject, regexp);
            }
        }
        else {
            pm_compile_regexp_dynamic(iseq, node, &((const pm_interpolated_regular_expression_node_t *) node)->parts, &location, ret, popped, scope_node);
            if (popped) PUSH_INSN(ret, location, pop);
        }
 
        return;
      }
      case PM_INTERPOLATED_STRING_NODE: {
        // "foo #{bar}"
        // ^^^^^^^^^^^^
        if (PM_NODE_FLAG_P(node, PM_NODE_FLAG_STATIC_LITERAL)) {
            if (!popped) {
                VALUE string = pm_static_literal_value(iseq, node, scope_node);
 
                if (PM_NODE_FLAG_P(node, PM_INTERPOLATED_STRING_NODE_FLAGS_FROZEN)) {
                    PUSH_INSN1(ret, location, putobject, string);
                }
                else if (PM_NODE_FLAG_P(node, PM_INTERPOLATED_STRING_NODE_FLAGS_MUTABLE)) {
                    PUSH_INSN1(ret, location, dupstring, string);
                }
                else {
                    PUSH_INSN1(ret, location, dupchilledstring, string);
                }
            }
        }
        else {
            const pm_interpolated_string_node_t *cast = (const pm_interpolated_string_node_t *) node;
            int length = pm_interpolated_node_compile(iseq, &cast->parts, &location, ret, popped, scope_node, NULL, NULL, PM_NODE_FLAG_P(cast, PM_INTERPOLATED_STRING_NODE_FLAGS_MUTABLE), PM_NODE_FLAG_P(cast, PM_INTERPOLATED_STRING_NODE_FLAGS_FROZEN));
            if (length > 1) PUSH_INSN1(ret, location, concatstrings, INT2FIX(length));
            if (popped) PUSH_INSN(ret, location, pop);
        }
 
        return;
      }
      case PM_INTERPOLATED_SYMBOL_NODE: {
        // :"foo #{bar}"
        // ^^^^^^^^^^^^^
        const pm_interpolated_symbol_node_t *cast = (const pm_interpolated_symbol_node_t *) node;
        int length = pm_interpolated_node_compile(iseq, &cast->parts, &location, ret, popped, scope_node, NULL, NULL, false, false);
 
        if (length > 1) {
            PUSH_INSN1(ret, location, concatstrings, INT2FIX(length));
        }
 
        if (!popped) {
            PUSH_INSN(ret, location, intern);
        }
        else {
            PUSH_INSN(ret, location, pop);
        }
 
        return;
      }
      case PM_INTERPOLATED_X_STRING_NODE: {
        // `foo #{bar}`
        // ^^^^^^^^^^^^
        const pm_interpolated_x_string_node_t *cast = (const pm_interpolated_x_string_node_t *) node;
 
        PUSH_INSN(ret, location, putself);
 
        int length = pm_interpolated_node_compile(iseq, &cast->parts, &location, ret, false, scope_node, NULL, NULL, false, false);
        if (length > 1) PUSH_INSN1(ret, location, concatstrings, INT2FIX(length));
 
        PUSH_SEND_WITH_FLAG(ret, location, idBackquote, INT2NUM(1), INT2FIX(VM_CALL_FCALL | VM_CALL_ARGS_SIMPLE));
        if (popped) PUSH_INSN(ret, location, pop);
 
        return;
      }
      case PM_IT_LOCAL_VARIABLE_READ_NODE: {
        // -> { it }
        //      ^^
        if (!popped) {
            pm_scope_node_t *current_scope_node = scope_node;
            int level = 0;
 
            while (current_scope_node) {
                if (current_scope_node->parameters && PM_NODE_TYPE_P(current_scope_node->parameters, PM_IT_PARAMETERS_NODE)) {
                    PUSH_GETLOCAL(ret, location, current_scope_node->local_table_for_iseq_size, level);
                    return;
                }
 
                current_scope_node = current_scope_node->previous;
                level++;
            }
            rb_bug("Local `it` does not exist");
        }
 
        return;
      }
      case PM_KEYWORD_HASH_NODE: {
        // foo(bar: baz)
        //     ^^^^^^^^
        const pm_keyword_hash_node_t *cast = (const pm_keyword_hash_node_t *) node;
        const pm_node_list_t *elements = &cast->elements;
 
        bool has_splat = false;
        for (size_t index = 0; index < elements->size; index++) {
            if (PM_NODE_TYPE_P(elements->nodes[index], PM_ASSOC_SPLAT_NODE)) {
                has_splat = true;
                break;
            }
        }
 
        if (has_splat) {
            pm_compile_hash_elements(iseq, node, elements, 0, Qundef, false, ret, scope_node);
        }
        else {
            const pm_node_t *element;
            PM_NODE_LIST_FOREACH(elements, index, element) {
                PM_COMPILE(element);
            }
 
            if (!popped) PUSH_INSN1(ret, location, newhash, INT2FIX(elements->size * 2));
        }
        return;
      }
      case PM_LAMBDA_NODE: {
        // -> {}
        // ^^^^^
        const pm_lambda_node_t *cast = (const pm_lambda_node_t *) node;
 
        pm_scope_node_t next_scope_node;
        pm_scope_node_init(node, &next_scope_node, scope_node);
 
        int opening_lineno = pm_location_line_number_cached(&cast->opening_loc, scope_node);
        const rb_iseq_t *block = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, opening_lineno);
        pm_scope_node_destroy(&next_scope_node);
 
        VALUE argc = INT2FIX(0);
        PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
        PUSH_CALL_WITH_BLOCK(ret, location, idLambda, argc, block);
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE) block);
 
        if (popped) PUSH_INSN(ret, location, pop);
        return;
      }
      case PM_LOCAL_VARIABLE_AND_WRITE_NODE: {
        // foo &&= bar
        // ^^^^^^^^^^^
        const pm_local_variable_and_write_node_t *cast = (const pm_local_variable_and_write_node_t *) node;
        LABEL *end_label = NEW_LABEL(location.line);
 
        pm_local_index_t local_index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
        PUSH_GETLOCAL(ret, location, local_index.index, local_index.level);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchunless, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_SETLOCAL(ret, location, local_index.index, local_index.level);
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_LOCAL_VARIABLE_OPERATOR_WRITE_NODE: {
        // foo += bar
        // ^^^^^^^^^^
        const pm_local_variable_operator_write_node_t *cast = (const pm_local_variable_operator_write_node_t *) node;
 
        pm_local_index_t local_index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
        PUSH_GETLOCAL(ret, location, local_index.index, local_index.level);
 
        PM_COMPILE_NOT_POPPED(cast->value);
 
        ID method_id = pm_constant_id_lookup(scope_node, cast->binary_operator);
        PUSH_SEND_WITH_FLAG(ret, location, method_id, INT2NUM(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
 
        if (!popped) PUSH_INSN(ret, location, dup);
        PUSH_SETLOCAL(ret, location, local_index.index, local_index.level);
 
        return;
      }
      case PM_LOCAL_VARIABLE_OR_WRITE_NODE: {
        // foo ||= bar
        // ^^^^^^^^^^^
        const pm_local_variable_or_write_node_t *cast = (const pm_local_variable_or_write_node_t *) node;
 
        LABEL *set_label = NEW_LABEL(location.line);
        LABEL *end_label = NEW_LABEL(location.line);
 
        PUSH_INSN1(ret, location, putobject, Qtrue);
        PUSH_INSNL(ret, location, branchunless, set_label);
 
        pm_local_index_t local_index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
        PUSH_GETLOCAL(ret, location, local_index.index, local_index.level);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_INSNL(ret, location, branchif, end_label);
        if (!popped) PUSH_INSN(ret, location, pop);
 
        PUSH_LABEL(ret, set_label);
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_SETLOCAL(ret, location, local_index.index, local_index.level);
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_LOCAL_VARIABLE_READ_NODE: {
        // foo
        // ^^^
        if (!popped) {
            const pm_local_variable_read_node_t *cast = (const pm_local_variable_read_node_t *) node;
            pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
            PUSH_GETLOCAL(ret, location, index.index, index.level);
        }
 
        return;
      }
      case PM_LOCAL_VARIABLE_WRITE_NODE: {
        // foo = 1
        // ^^^^^^^
        const pm_local_variable_write_node_t *cast = (const pm_local_variable_write_node_t *) node;
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, cast->name, cast->depth);
        PUSH_SETLOCAL(ret, location, index.index, index.level);
        return;
      }
      case PM_MATCH_LAST_LINE_NODE: {
        // if /foo/ then end
        //    ^^^^^
        VALUE regexp = pm_static_literal_value(iseq, node, scope_node);
 
        PUSH_INSN1(ret, location, putobject, regexp);
        PUSH_INSN2(ret, location, getspecial, INT2FIX(0), INT2FIX(0));
        PUSH_SEND(ret, location, idEqTilde, INT2NUM(1));
        if (popped) PUSH_INSN(ret, location, pop);
 
        return;
      }
      case PM_MATCH_PREDICATE_NODE: {
        // foo in bar
        // ^^^^^^^^^^
        const pm_match_predicate_node_t *cast = (const pm_match_predicate_node_t *) node;
 
        // First, allocate some stack space for the cached return value of any
        // calls to #deconstruct.
        PUSH_INSN(ret, location, putnil);
 
        // Next, compile the expression that we're going to match against.
        PM_COMPILE_NOT_POPPED(cast->value);
        PUSH_INSN(ret, location, dup);
 
        // Now compile the pattern that is going to be used to match against the
        // expression.
        LABEL *matched_label = NEW_LABEL(location.line);
        LABEL *unmatched_label = NEW_LABEL(location.line);
        LABEL *done_label = NEW_LABEL(location.line);
        pm_compile_pattern(iseq, scope_node, cast->pattern, ret, matched_label, unmatched_label, false, true, 2);
 
        // If the pattern did not match, then compile the necessary instructions
        // to handle pushing false onto the stack, then jump to the end.
        PUSH_LABEL(ret, unmatched_label);
        PUSH_INSN(ret, location, pop);
        PUSH_INSN(ret, location, pop);
 
        if (!popped) PUSH_INSN1(ret, location, putobject, Qfalse);
        PUSH_INSNL(ret, location, jump, done_label);
        PUSH_INSN(ret, location, putnil);
 
        // If the pattern did match, then compile the necessary instructions to
        // handle pushing true onto the stack, then jump to the end.
        PUSH_LABEL(ret, matched_label);
        PUSH_INSN1(ret, location, adjuststack, INT2FIX(2));
        if (!popped) PUSH_INSN1(ret, location, putobject, Qtrue);
        PUSH_INSNL(ret, location, jump, done_label);
 
        PUSH_LABEL(ret, done_label);
        return;
      }
      case PM_MATCH_REQUIRED_NODE:
        // foo => bar
        // ^^^^^^^^^^
        //
        // A match required node represents pattern matching against a single
        // pattern using the => operator. For example,
        //
        //     foo => bar
        //
        // This is somewhat analogous to compiling a case match statement with a
        // single pattern. In both cases, if the pattern fails it should
        // immediately raise an error.
        pm_compile_match_required_node(iseq, (const pm_match_required_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_MATCH_WRITE_NODE:
        // /(?<foo>foo)/ =~ bar
        // ^^^^^^^^^^^^^^^^^^^^
        //
        // Match write nodes are specialized call nodes that have a regular
        // expression with valid named capture groups on the left, the =~
        // operator, and some value on the right. The nodes themselves simply
        // wrap the call with the local variable targets that will be written
        // when the call is executed.
        pm_compile_match_write_node(iseq, (const pm_match_write_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_ERROR_RECOVERY_NODE:
        rb_bug("A pm_error_recovery_node_t should not exist in prism's AST.");
        return;
      case PM_MODULE_NODE: {
        // module Foo; end
        // ^^^^^^^^^^^^^^^
        const pm_module_node_t *cast = (const pm_module_node_t *) node;
 
        ID module_id = pm_constant_id_lookup(scope_node, cast->name);
        VALUE module_name = rb_str_freeze(rb_sprintf("<module:%"PRIsVALUE">", rb_id2str(module_id)));
 
        pm_scope_node_t next_scope_node;
        pm_scope_node_init((const pm_node_t *) cast, &next_scope_node, scope_node);
 
        const rb_iseq_t *module_iseq = NEW_CHILD_ISEQ(&next_scope_node, module_name, ISEQ_TYPE_CLASS, location.line);
        pm_scope_node_destroy(&next_scope_node);
 
        const int flags = VM_DEFINECLASS_TYPE_MODULE | pm_compile_class_path(iseq, cast->constant_path, &location, ret, false, scope_node);
        PUSH_INSN(ret, location, putnil);
        PUSH_INSN3(ret, location, defineclass, ID2SYM(module_id), module_iseq, INT2FIX(flags));
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE) module_iseq);
 
        if (popped) PUSH_INSN(ret, location, pop);
        return;
      }
      case PM_REQUIRED_PARAMETER_NODE: {
        // def foo(bar); end
        //         ^^^
        const pm_required_parameter_node_t *cast = (const pm_required_parameter_node_t *) node;
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, cast->name, 0);
 
        PUSH_SETLOCAL(ret, location, index.index, index.level);
        return;
      }
      case PM_MULTI_WRITE_NODE: {
        // foo, bar = baz
        // ^^^^^^^^^^^^^^
        //
        // A multi write node represents writing to multiple values using an =
        // operator. Importantly these nodes are only parsed when the left-hand
        // side of the operator has multiple targets. The right-hand side of the
        // operator having multiple targets represents an implicit array
        // instead.
        const pm_multi_write_node_t *cast = (const pm_multi_write_node_t *) node;
 
        DECL_ANCHOR(writes);
        DECL_ANCHOR(cleanup);
 
        pm_multi_target_state_t state = { 0 };
        state.position = popped ? 0 : 1;
        pm_compile_multi_target_node(iseq, node, ret, writes, cleanup, scope_node, &state);
 
        PM_COMPILE_NOT_POPPED(cast->value);
        if (!popped) PUSH_INSN(ret, location, dup);
 
        PUSH_SEQ(ret, writes);
        if (!popped && state.stack_size >= 1) {
            // Make sure the value on the right-hand side of the = operator is
            // being returned before we pop the parent expressions.
            PUSH_INSN1(ret, location, setn, INT2FIX(state.stack_size));
        }
 
        // Now, we need to go back and modify the topn instructions in order to
        // ensure they can correctly retrieve the parent expressions.
        pm_multi_target_state_update(&state);
 
        PUSH_SEQ(ret, cleanup);
        return;
      }
      case PM_NEXT_NODE:
        // next
        // ^^^^
        //
        // next foo
        // ^^^^^^^^
        pm_compile_next_node(iseq, (const pm_next_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_NIL_NODE: {
        // nil
        // ^^^
        if (!popped) {
            PUSH_INSN(ret, location, putnil);
        }
 
        return;
      }
      case PM_NO_BLOCK_PARAMETER_NODE: {
        // def foo(&nil); end
        //         ^^^^
        ISEQ_BODY(iseq)->param.flags.accepts_no_block = TRUE;
        return;
      }
      case PM_NO_KEYWORDS_PARAMETER_NODE: {
        // def foo(**nil); end
        //         ^^^^^
        ISEQ_BODY(iseq)->param.flags.accepts_no_kwarg = TRUE;
        return;
      }
      case PM_NUMBERED_REFERENCE_READ_NODE: {
        // $1
        // ^^
        if (!popped) {
            const pm_numbered_reference_read_node_t *cast = (const pm_numbered_reference_read_node_t *) node;
 
            if (cast->number != 0) {
                VALUE ref = pm_compile_numbered_reference_ref(cast);
                PUSH_INSN2(ret, location, getspecial, INT2FIX(1), ref);
            }
            else {
                PUSH_INSN(ret, location, putnil);
            }
        }
 
        return;
      }
      case PM_OR_NODE: {
        // a or b
        // ^^^^^^
        const pm_or_node_t *cast = (const pm_or_node_t *) node;
 
        LABEL *end_label = NEW_LABEL(location.line);
        PM_COMPILE_NOT_POPPED(cast->left);
 
        if (!popped) PUSH_INSN(ret, location, dup);
        PUSH_INSNL(ret, location, branchif, end_label);
 
        if (!popped) PUSH_INSN(ret, location, pop);
        PM_COMPILE(cast->right);
        PUSH_LABEL(ret, end_label);
 
        return;
      }
      case PM_OPTIONAL_PARAMETER_NODE: {
        // def foo(bar = 1); end
        //         ^^^^^^^
        const pm_optional_parameter_node_t *cast = (const pm_optional_parameter_node_t *) node;
        PM_COMPILE_NOT_POPPED(cast->value);
 
        pm_local_index_t index = pm_lookup_local_index(iseq, scope_node, cast->name, 0);
        PUSH_SETLOCAL(ret, location, index.index, index.level);
 
        return;
      }
      case PM_PARENTHESES_NODE: {
        // ()
        // ^^
        //
        // (1)
        // ^^^
        const pm_parentheses_node_t *cast = (const pm_parentheses_node_t *) node;
 
        if (cast->body != NULL) {
            PM_COMPILE(cast->body);
        }
        else if (!popped) {
            PUSH_INSN(ret, location, putnil);
        }
 
        return;
      }
      case PM_PRE_EXECUTION_NODE: {
        // BEGIN {}
        // ^^^^^^^^
        const pm_pre_execution_node_t *cast = (const pm_pre_execution_node_t *) node;
 
        LINK_ANCHOR *outer_pre = scope_node->pre_execution_anchor;
        RUBY_ASSERT(outer_pre != NULL);
 
        // BEGIN{} nodes can be nested, so here we're going to do the same thing
        // that we did for the top-level compilation where we create two
        // anchors and then join them in the correct order into the resulting
        // anchor.
        DECL_ANCHOR(inner_pre);
        scope_node->pre_execution_anchor = inner_pre;
 
        DECL_ANCHOR(inner_body);
 
        if (cast->statements != NULL) {
            const pm_node_list_t *body = &cast->statements->body;
 
            for (size_t index = 0; index < body->size; index++) {
                pm_compile_node(iseq, body->nodes[index], inner_body, true, scope_node);
            }
        }
 
        if (!popped) {
            PUSH_INSN(inner_body, location, putnil);
        }
 
        // Now that everything has been compiled, join both anchors together
        // into the correct outer pre execution anchor, and reset the value so
        // that subsequent BEGIN{} nodes can be compiled correctly.
        PUSH_SEQ(outer_pre, inner_pre);
        PUSH_SEQ(outer_pre, inner_body);
        scope_node->pre_execution_anchor = outer_pre;
 
        return;
      }
      case PM_POST_EXECUTION_NODE: {
        // END {}
        // ^^^^^^
        const rb_iseq_t *child_iseq;
        const rb_iseq_t *prevblock = ISEQ_COMPILE_DATA(iseq)->current_block;
 
        pm_scope_node_t next_scope_node;
        pm_scope_node_init(node, &next_scope_node, scope_node);
        child_iseq = NEW_CHILD_ISEQ(&next_scope_node, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, lineno);
        pm_scope_node_destroy(&next_scope_node);
 
        ISEQ_COMPILE_DATA(iseq)->current_block = child_iseq;
 
        int is_index = ISEQ_BODY(iseq)->ise_size++;
        PUSH_INSN2(ret, location, once, child_iseq, INT2FIX(is_index));
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE) child_iseq);
        if (popped) PUSH_INSN(ret, location, pop);
 
        ISEQ_COMPILE_DATA(iseq)->current_block = prevblock;
 
        return;
      }
      case PM_RANGE_NODE: {
        // 0..5
        // ^^^^
        const pm_range_node_t *cast = (const pm_range_node_t *) node;
        bool exclude_end = PM_NODE_FLAG_P(cast, PM_RANGE_FLAGS_EXCLUDE_END);
 
        if (pm_optimizable_range_item_p(cast->left) && pm_optimizable_range_item_p(cast->right))  {
            if (!popped) {
                const pm_node_t *left = cast->left;
                const pm_node_t *right = cast->right;
 
                VALUE val = rb_range_new(
                    (left && PM_NODE_TYPE_P(left, PM_INTEGER_NODE)) ? parse_integer((const pm_integer_node_t *) left) : Qnil,
                    (right && PM_NODE_TYPE_P(right, PM_INTEGER_NODE)) ? parse_integer((const pm_integer_node_t *) right) : Qnil,
                    exclude_end
                );
 
                RB_OBJ_SET_SHAREABLE(val);
                PUSH_INSN1(ret, location, putobject, val);
            }
        }
        else {
            if (cast->left != NULL) {
                PM_COMPILE(cast->left);
            }
            else if (!popped) {
                PUSH_INSN(ret, location, putnil);
            }
 
            if (cast->right != NULL) {
                PM_COMPILE(cast->right);
            }
            else if (!popped) {
                PUSH_INSN(ret, location, putnil);
            }
 
            if (!popped) {
                PUSH_INSN1(ret, location, newrange, INT2FIX(exclude_end ? 1 : 0));
            }
        }
        return;
      }
      case PM_RATIONAL_NODE: {
        // 1r
        // ^^
        if (!popped) {
            PUSH_INSN1(ret, location, putobject, parse_rational((const pm_rational_node_t *) node));
        }
        return;
      }
      case PM_REDO_NODE:
        // redo
        // ^^^^
        pm_compile_redo_node(iseq, &location, ret, popped, scope_node);
        return;
      case PM_REGULAR_EXPRESSION_NODE: {
        // /foo/
        // ^^^^^
        if (!popped) {
            VALUE regexp = pm_static_literal_value(iseq, node, scope_node);
            PUSH_INSN1(ret, location, putobject, regexp);
        }
        return;
      }
      case PM_RESCUE_NODE:
        // begin; rescue; end
        //        ^^^^^^^
        pm_compile_rescue_node(iseq, (const pm_rescue_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_RESCUE_MODIFIER_NODE: {
        // foo rescue bar
        // ^^^^^^^^^^^^^^
        const pm_rescue_modifier_node_t *cast = (const pm_rescue_modifier_node_t *) node;
 
        pm_scope_node_t rescue_scope_node;
        pm_scope_node_init((const pm_node_t *) cast, &rescue_scope_node, scope_node);
 
        rb_iseq_t *rescue_iseq = NEW_CHILD_ISEQ(
            &rescue_scope_node,
            rb_str_concat(rb_str_new2("rescue in "), ISEQ_BODY(iseq)->location.label),
            ISEQ_TYPE_RESCUE,
            pm_node_line_number_cached(cast->rescue_expression, scope_node)
        );
 
        pm_scope_node_destroy(&rescue_scope_node);
 
        LABEL *lstart = NEW_LABEL(location.line);
        LABEL *lend = NEW_LABEL(location.line);
        LABEL *lcont = NEW_LABEL(location.line);
 
        lstart->rescued = LABEL_RESCUE_BEG;
        lend->rescued = LABEL_RESCUE_END;
 
        PUSH_LABEL(ret, lstart);
        PM_COMPILE_NOT_POPPED(cast->expression);
        PUSH_LABEL(ret, lend);
 
        PUSH_INSN(ret, location, nop);
        PUSH_LABEL(ret, lcont);
        if (popped) PUSH_INSN(ret, location, pop);
 
        PUSH_CATCH_ENTRY(CATCH_TYPE_RESCUE, lstart, lend, rescue_iseq, lcont);
        PUSH_CATCH_ENTRY(CATCH_TYPE_RETRY, lend, lcont, NULL, lstart);
        return;
      }
      case PM_RETURN_NODE:
        // return
        // ^^^^^^
        //
        // return 1
        // ^^^^^^^^
        pm_compile_return_node(iseq, (const pm_return_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_RETRY_NODE: {
        // retry
        // ^^^^^
        if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_RESCUE) {
            PUSH_INSN(ret, location, putnil);
            PUSH_INSN1(ret, location, throw, INT2FIX(TAG_RETRY));
            if (popped) PUSH_INSN(ret, location, pop);
        }
        else {
            COMPILE_ERROR(iseq, location.line, "Invalid retry");
            return;
        }
        return;
      }
      case PM_SCOPE_NODE:
        pm_compile_scope_node(iseq, (pm_scope_node_t *) node, &location, ret, popped);
        return;
      case PM_SELF_NODE: {
        // self
        // ^^^^
        if (!popped) {
            PUSH_INSN(ret, location, putself);
        }
        return;
      }
      case PM_SHAREABLE_CONSTANT_NODE: {
        // A value that is being written to a constant that is being marked as
        // shared depending on the current lexical context.
        const pm_shareable_constant_node_t *cast = (const pm_shareable_constant_node_t *) node;
        pm_node_flags_t shareability = (cast->base.flags & (PM_SHAREABLE_CONSTANT_NODE_FLAGS_LITERAL | PM_SHAREABLE_CONSTANT_NODE_FLAGS_EXPERIMENTAL_EVERYTHING | PM_SHAREABLE_CONSTANT_NODE_FLAGS_EXPERIMENTAL_COPY));
 
        switch (PM_NODE_TYPE(cast->write)) {
          case PM_CONSTANT_WRITE_NODE:
            pm_compile_constant_write_node(iseq, (const pm_constant_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_AND_WRITE_NODE:
            pm_compile_constant_and_write_node(iseq, (const pm_constant_and_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_OR_WRITE_NODE:
            pm_compile_constant_or_write_node(iseq, (const pm_constant_or_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_OPERATOR_WRITE_NODE:
            pm_compile_constant_operator_write_node(iseq, (const pm_constant_operator_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_PATH_WRITE_NODE:
            pm_compile_constant_path_write_node(iseq, (const pm_constant_path_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_PATH_AND_WRITE_NODE:
            pm_compile_constant_path_and_write_node(iseq, (const pm_constant_path_and_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_PATH_OR_WRITE_NODE:
            pm_compile_constant_path_or_write_node(iseq, (const pm_constant_path_or_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          case PM_CONSTANT_PATH_OPERATOR_WRITE_NODE:
            pm_compile_constant_path_operator_write_node(iseq, (const pm_constant_path_operator_write_node_t *) cast->write, shareability, &location, ret, popped, scope_node);
            break;
          default:
            rb_bug("Unexpected node type for shareable constant write: %s", pm_node_type(PM_NODE_TYPE(cast->write)));
            break;
        }
 
        return;
      }
      case PM_SINGLETON_CLASS_NODE: {
        // class << self; end
        // ^^^^^^^^^^^^^^^^^^
        const pm_singleton_class_node_t *cast = (const pm_singleton_class_node_t *) node;
 
        pm_scope_node_t next_scope_node;
        pm_scope_node_init((const pm_node_t *) cast, &next_scope_node, scope_node);
        const rb_iseq_t *child_iseq = NEW_ISEQ(&next_scope_node, rb_fstring_lit("singleton class"), ISEQ_TYPE_CLASS, location.line);
        pm_scope_node_destroy(&next_scope_node);
 
        PM_COMPILE_NOT_POPPED(cast->expression);
        PUSH_INSN(ret, location, putnil);
 
        ID singletonclass;
        CONST_ID(singletonclass, "singletonclass");
 
        /* `class << self` in a class body and `class << Foo` (constant
           receiver) are stable. All other forms are potentially dynamic. */
        int sclass_flags = VM_DEFINECLASS_TYPE_SINGLETON_CLASS;
        if (!(PM_NODE_TYPE_P(cast->expression, PM_SELF_NODE) &&
              ISEQ_BODY(iseq)->type == ISEQ_TYPE_CLASS) &&
            !pm_cpath_const_p(cast->expression)) {
            sclass_flags |= VM_DEFINECLASS_FLAG_DYNAMIC_CREF;
        }
 
        PUSH_INSN3(ret, location, defineclass, ID2SYM(singletonclass), child_iseq, INT2FIX(sclass_flags));
 
        if (popped) PUSH_INSN(ret, location, pop);
        RB_OBJ_WRITTEN(iseq, Qundef, (VALUE) child_iseq);
 
        return;
      }
      case PM_SOURCE_ENCODING_NODE: {
        // __ENCODING__
        // ^^^^^^^^^^^^
        if (!popped) {
            VALUE value = pm_static_literal_value(iseq, node, scope_node);
            PUSH_INSN1(ret, location, putobject, value);
        }
        return;
      }
      case PM_SOURCE_FILE_NODE: {
        // __FILE__
        // ^^^^^^^^
        if (!popped) {
            const pm_source_file_node_t *cast = (const pm_source_file_node_t *) node;
            VALUE string = pm_source_file_value(cast, scope_node);
 
            if (PM_NODE_FLAG_P(cast, PM_STRING_FLAGS_FROZEN)) {
                PUSH_INSN1(ret, location, putobject, string);
            }
            else if (PM_NODE_FLAG_P(cast, PM_STRING_FLAGS_MUTABLE)) {
                PUSH_INSN1(ret, location, dupstring, string);
            }
            else {
                PUSH_INSN1(ret, location, dupchilledstring, string);
            }
        }
        return;
      }
      case PM_SOURCE_LINE_NODE: {
        // __LINE__
        // ^^^^^^^^
        if (!popped) {
            VALUE value = pm_static_literal_value(iseq, node, scope_node);
            PUSH_INSN1(ret, location, putobject, value);
        }
        return;
      }
      case PM_SPLAT_NODE: {
        // foo(*bar)
        //     ^^^^
        const pm_splat_node_t *cast = (const pm_splat_node_t *) node;
        if (cast->expression) {
            PM_COMPILE(cast->expression);
        }
 
        if (!popped) {
            PUSH_INSN1(ret, location, splatarray, Qtrue);
        }
        return;
      }
      case PM_STATEMENTS_NODE: {
        // A list of statements.
        const pm_statements_node_t *cast = (const pm_statements_node_t *) node;
        const pm_node_list_t *body = &cast->body;
 
        if (body->size > 0) {
            for (size_t index = 0; index < body->size - 1; index++) {
                PM_COMPILE_POPPED(body->nodes[index]);
            }
            PM_COMPILE(body->nodes[body->size - 1]);
        }
        else {
            PUSH_INSN(ret, location, putnil);
        }
        return;
      }
      case PM_STRING_NODE: {
        // "foo"
        // ^^^^^
        if (!popped) {
            const pm_string_node_t *cast = (const pm_string_node_t *) node;
            VALUE value = parse_static_literal_string(iseq, scope_node, node, &cast->unescaped);
 
            if (PM_NODE_FLAG_P(node, PM_STRING_FLAGS_FROZEN)) {
                PUSH_INSN1(ret, location, putobject, value);
            }
            else if (PM_NODE_FLAG_P(node, PM_STRING_FLAGS_MUTABLE)) {
                PUSH_INSN1(ret, location, dupstring, value);
            }
            else {
                PUSH_INSN1(ret, location, dupchilledstring, value);
            }
        }
        return;
      }
      case PM_SUPER_NODE:
        // super()
        // super(foo)
        // super(...)
        pm_compile_super_node(iseq, (const pm_super_node_t *) node, &location, ret, popped, scope_node);
        return;
      case PM_SYMBOL_NODE: {
        // :foo
        // ^^^^
        if (!popped) {
            VALUE value = pm_static_literal_value(iseq, node, scope_node);
            PUSH_INSN1(ret, location, putobject, value);
        }
        return;
      }
      case PM_TRUE_NODE: {
        // true
        // ^^^^
        if (!popped) {
            PUSH_INSN1(ret, location, putobject, Qtrue);
        }
        return;
      }
      case PM_UNDEF_NODE: {
        // undef foo
        // ^^^^^^^^^
        const pm_undef_node_t *cast = (const pm_undef_node_t *) node;
        const pm_node_list_t *names = &cast->names;
 
        for (size_t index = 0; index < names->size; index++) {
            PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
            PUSH_INSN1(ret, location, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CBASE));
 
            PM_COMPILE_NOT_POPPED(names->nodes[index]);
            PUSH_SEND(ret, location, id_core_undef_method, INT2NUM(2));
 
            if (index < names->size - 1) {
                PUSH_INSN(ret, location, pop);
            }
        }
 
        if (popped) PUSH_INSN(ret, location, pop);
        return;
      }
      case PM_UNLESS_NODE: {
        // unless foo; bar end
        // ^^^^^^^^^^^^^^^^^^^
        //
        // bar unless foo
        // ^^^^^^^^^^^^^^
        const pm_unless_node_t *cast = (const pm_unless_node_t *) node;
        const pm_statements_node_t *statements = NULL;
        if (cast->else_clause != NULL) {
            statements = ((const pm_else_node_t *) cast->else_clause)->statements;
        }
 
        pm_compile_conditional(iseq, &location, PM_UNLESS_NODE, (const pm_node_t *) cast, statements, (const pm_node_t *) cast->statements, cast->predicate, ret, popped, scope_node);
        return;
      }
      case PM_UNTIL_NODE: {
        // until foo; bar end
        // ^^^^^^^^^^^^^^^^^
        //
        // bar until foo
        // ^^^^^^^^^^^^^
        const pm_until_node_t *cast = (const pm_until_node_t *) node;
        pm_compile_loop(iseq, &location, cast->base.flags, PM_UNTIL_NODE, (const pm_node_t *) cast, cast->statements, cast->predicate, ret, popped, scope_node);
        return;
      }
      case PM_WHILE_NODE: {
        // while foo; bar end
        // ^^^^^^^^^^^^^^^^^^
        //
        // bar while foo
        // ^^^^^^^^^^^^^
        const pm_while_node_t *cast = (const pm_while_node_t *) node;
        pm_compile_loop(iseq, &location, cast->base.flags, PM_WHILE_NODE, (const pm_node_t *) cast, cast->statements, cast->predicate, ret, popped, scope_node);
        return;
      }
      case PM_X_STRING_NODE: {
        // `foo`
        // ^^^^^
        const pm_x_string_node_t *cast = (const pm_x_string_node_t *) node;
        VALUE value = parse_static_literal_string(iseq, scope_node, node, &cast->unescaped);
 
        PUSH_INSN(ret, location, putself);
        PUSH_INSN1(ret, location, putobject, value);
        PUSH_SEND_WITH_FLAG(ret, location, idBackquote, INT2NUM(1), INT2FIX(VM_CALL_FCALL | VM_CALL_ARGS_SIMPLE));
        if (popped) PUSH_INSN(ret, location, pop);
 
        return;
      }
      case PM_YIELD_NODE:
        // yield
        // ^^^^^
        //
        // yield 1
        // ^^^^^^^
        pm_compile_yield_node(iseq, (const pm_yield_node_t *) node, &location, ret, popped, scope_node);
        return;
      default:
        rb_raise(rb_eNotImpError, "node type %s not implemented", pm_node_type(PM_NODE_TYPE(node)));
        return;
    }
}
 
#undef PM_CONTAINER_P
 
static inline bool
pm_iseq_pre_execution_p(rb_iseq_t *iseq)
{
    switch (ISEQ_BODY(iseq)->type) {
      case ISEQ_TYPE_TOP:
      case ISEQ_TYPE_EVAL:
      case ISEQ_TYPE_MAIN:
        return true;
      default:
        return false;
    }
}
 
VALUE
pm_iseq_compile_node(rb_iseq_t *iseq, pm_scope_node_t *node)
{
    DECL_ANCHOR(ret);
 
    if (pm_iseq_pre_execution_p(iseq)) {
        // Because these ISEQs can have BEGIN{}, we're going to create two
        // anchors to compile them, a "pre" and a "body". We'll mark the "pre"
        // on the scope node so that when BEGIN{} is found, its contents will be
        // added to the "pre" anchor.
        DECL_ANCHOR(pre);
        node->pre_execution_anchor = pre;
 
        // Now we'll compile the body as normal. We won't compile directly into
        // the "ret" anchor yet because we want to add the "pre" anchor to the
        // beginning of the "ret" anchor first.
        DECL_ANCHOR(body);
        pm_compile_node(iseq, (const pm_node_t *) node, body, false, node);
 
        // Now we'll join both anchors together so that the content is in the
        // correct order.
        PUSH_SEQ(ret, pre);
        PUSH_SEQ(ret, body);
    }
    else {
        // In other circumstances, we can just compile the node directly into
        // the "ret" anchor.
        pm_compile_node(iseq, (const pm_node_t *) node, ret, false, node);
    }
 
    CHECK(iseq_setup_insn(iseq, ret));
    return iseq_setup(iseq, ret);
}
 
void
pm_parse_result_init(pm_parse_result_t *result)
{
    memset(result, 0, sizeof(pm_parse_result_t));
    result->arena = pm_arena_new();
    result->options = pm_options_new();
    pm_options_line_set(result->options, 1);
}
 
void
pm_parse_result_free(pm_parse_result_t *result)
{
    if (result->parsed) {
        SIZED_FREE_N(result->node.constants, pm_parser_constants_size(result->node.parser));
        pm_scope_node_destroy(&result->node);
    }
 
    if (result->parser) pm_parser_free(result->parser);
    pm_arena_free(result->arena);
    if (result->source) pm_source_free(result->source);
    pm_options_free(result->options);
}
 
static VALUE
pm_parse_process_error(const pm_parse_result_t *result)
{
    const pm_parser_t *parser = result->parser;
    pm_buffer_t *buffer = pm_buffer_new();
    if (buffer == NULL) {
        return rb_exc_new_cstr(rb_eNoMemError, "failed to allocate memory");
    }
 
    pm_errors_format_type_t format_type;
    if (rb_stderr_tty_p()) {
        const char *no_color = getenv("NO_COLOR");
        if (no_color == NULL || no_color[0] == '\0') {
            format_type = PM_ERRORS_FORMAT_COLOR;
        } else {
            format_type = PM_ERRORS_FORMAT_STYLE;
        }
    } else {
        format_type = PM_ERRORS_FORMAT_PLAIN;
    }
 
    pm_error_level_t error_level = pm_errors_format(parser, buffer, format_type);
 
    rb_encoding *message_encoding = (error_level == PM_ERROR_LEVEL_LOAD) ? rb_locale_encoding() : rb_enc_find(pm_parser_encoding_name(parser));
    VALUE message = rb_enc_str_new(pm_buffer_value(buffer), (long) pm_buffer_length(buffer), message_encoding);
    pm_buffer_free(buffer);
 
    VALUE error = Qnil;
    switch (error_level) {
        case PM_ERROR_LEVEL_SYNTAX: {
            error = rb_exc_new_str(rb_eSyntaxError, message);
 
            const pm_string_t *filepath = pm_parser_filepath(result->parser);
            rb_encoding *filepath_encoding = result->node.filepath_encoding != NULL ? result->node.filepath_encoding : rb_utf8_encoding();
 
            VALUE path = rb_enc_str_new((const char *) pm_string_source(filepath), pm_string_length(filepath), filepath_encoding);
            rb_ivar_set(error, rb_intern_const("@path"), path);
            break;
        }
        case PM_ERROR_LEVEL_ARGUMENT:
            error = rb_exc_new_str(rb_eArgError, message);
            break;
        case PM_ERROR_LEVEL_LOAD:
            error = rb_exc_new_str(rb_eLoadError, message);
            rb_ivar_set(error, rb_intern_const("@path"), Qnil);
            break;
    }
 
    return error;
}
 
typedef struct {
    ID *constants;
    rb_encoding *encoding;
    size_t index;
} pm_intern_constants_ctx_t;
 
static void
pm_intern_constants_callback(const pm_constant_t *constant, void *data)
{
    pm_intern_constants_ctx_t *ctx = (pm_intern_constants_ctx_t *) data;
    ctx->constants[ctx->index++] = rb_intern3((const char *) pm_constant_start(constant), pm_constant_length(constant), ctx->encoding);
}
 
typedef struct {
    const pm_parser_t *parser;
    rb_encoding *encoding;
    const char *filepath;
} pm_warning_emit_ctx_t;
 
static void
pm_warning_emit_callback(const pm_diagnostic_t *diagnostic, void *data) {
    pm_warning_emit_ctx_t *ctx = (pm_warning_emit_ctx_t *) data;
    pm_location_t loc = pm_diagnostic_location(diagnostic);
    int line = pm_location_line_number(ctx->parser, &loc);
 
    if (pm_diagnostic_warning_level(diagnostic) == PM_WARNING_LEVEL_VERBOSE) {
        rb_enc_compile_warning(ctx->encoding, ctx->filepath, line, "%s", pm_diagnostic_message(diagnostic));
    }
    else {
        rb_enc_compile_warn(ctx->encoding, ctx->filepath, line, "%s", pm_diagnostic_message(diagnostic));
    }
}
 
static uint64_t
pm_source_hash(const pm_parser_t *parser)
{
    const uint8_t *start = pm_parser_start(parser);
    const uint8_t *end = pm_parser_end(parser);
    const pm_location_t *data_loc = pm_parser_data_loc(parser);
 
    if (data_loc->length != 0) {
        const uint8_t *cursor = start + data_loc->start;
        while (cursor < end && *cursor != '\n') cursor++;
        if (cursor < end) cursor++;
        end = cursor;
    }
 
    rb_source_hash_state_t state;
    rb_source_hash_init(&state);
    rb_source_hash_update(&state, start, (size_t) (end - start));
    return rb_source_hash_finalize(&state);
}
 
static VALUE
pm_parse_process(pm_parse_result_t *result, pm_node_t *node, VALUE *script_lines)
{
    pm_parser_t *parser = result->parser;
 
    // First, set up the scope node so that the AST node is attached and can be
    // freed regardless of whether or we return an error.
    pm_scope_node_t *scope_node = &result->node;
    rb_encoding *filepath_encoding = scope_node->filepath_encoding;
    int coverage_enabled = scope_node->coverage_enabled;
 
    pm_scope_node_init(node, scope_node, NULL);
    scope_node->filepath_encoding = filepath_encoding;
 
    const char *encoding_name = pm_parser_encoding_name(parser);
    scope_node->encoding = rb_enc_find(encoding_name);
    if (!scope_node->encoding) rb_bug("Encoding not found %s!", encoding_name);
 
    scope_node->coverage_enabled = coverage_enabled;
 
    // If RubyVM.keep_script_lines is set to true, then we need to create that
    // array of script lines here.
    if (script_lines != NULL) {
        const pm_line_offset_list_t *line_offsets = pm_parser_line_offsets(parser);
        *script_lines = rb_ary_new_capa(line_offsets->size);
 
        for (size_t index = 0; index < line_offsets->size; index++) {
            size_t offset = line_offsets->offsets[index];
            size_t length = index == line_offsets->size - 1 ? ((size_t) (pm_parser_end(parser) - (pm_parser_start(parser) + offset))) : (line_offsets->offsets[index + 1] - offset);
            rb_ary_push(*script_lines, rb_enc_str_new((const char *) pm_parser_start(parser) + offset, length, scope_node->encoding));
        }
 
        scope_node->script_lines = script_lines;
    }
 
    // Emit all of the various warnings from the parse.
    pm_warning_emit_ctx_t warning_ctx = {
        .parser = parser,
        .encoding = scope_node->encoding,
        .filepath = (const char *) pm_string_source(pm_parser_filepath(parser))
    };
    pm_parser_warnings_each(parser, pm_warning_emit_callback, &warning_ctx);
 
    // If there are errors, raise an appropriate error and free the result.
    if (pm_parser_errors_size(parser) > 0) {
        VALUE error = pm_parse_process_error(result);
 
        // TODO: We need to set the backtrace.
        // rb_funcallv(error, rb_intern("set_backtrace"), 1, &path);
        return error;
    }
 
    // Now set up the constant pool and intern all of the various constants into
    // their corresponding IDs.
    scope_node->parser = parser;
    scope_node->source_hash = pm_source_hash(parser);
    scope_node->options = result->options;
    scope_node->line_offsets = pm_parser_line_offsets(parser);
    scope_node->start_line = pm_parser_start_line(parser);
    size_t constants_size = pm_parser_constants_size(parser);
    scope_node->constants = constants_size ? xmalloc(constants_size * sizeof(ID)) : NULL;
 
    pm_intern_constants_ctx_t intern_ctx = { .constants = scope_node->constants, .encoding = scope_node->encoding, .index = 0 };
    pm_parser_constants_each(parser, pm_intern_constants_callback, &intern_ctx);
 
    // If we got here, this is a success and we can return Qnil to indicate that
    // no error should be raised.
    result->parsed = true;
    return Qnil;
}
 
static void
pm_options_frozen_string_literal_init(pm_options_t *options)
{
    int frozen_string_literal = rb_iseq_opt_frozen_string_literal();
 
    switch (frozen_string_literal) {
      case ISEQ_FROZEN_STRING_LITERAL_UNSET:
        break;
      case ISEQ_FROZEN_STRING_LITERAL_DISABLED:
        pm_options_frozen_string_literal_set(options, false);
        break;
      case ISEQ_FROZEN_STRING_LITERAL_ENABLED:
        pm_options_frozen_string_literal_set(options, true);
        break;
      default:
        rb_bug("pm_options_frozen_string_literal_init: invalid frozen_string_literal=%d", frozen_string_literal);
        break;
    }
}
 
static inline VALUE
pm_parse_file_script_lines(const pm_scope_node_t *scope_node, const pm_parser_t *parser)
{
    const pm_line_offset_list_t *line_offsets = pm_parser_line_offsets(parser);
    const char *start = (const char *) pm_parser_start(parser);
    const char *end = (const char *) pm_parser_end(parser);
 
    // If we end exactly on a newline, then there's no need to push on a final
    // segment. If we don't, then we need to push on the last offset up to the
    // end of the string.
    size_t last_offset = line_offsets->offsets[line_offsets->size - 1];
    bool last_push = start + last_offset != end;
 
    // Create the ruby strings that represent the lines of the source.
    VALUE lines = rb_ary_new_capa(line_offsets->size - (last_push ? 0 : 1));
 
    for (size_t index = 0; index < line_offsets->size - 1; index++) {
        size_t offset = line_offsets->offsets[index];
        size_t length = line_offsets->offsets[index + 1] - offset;
 
        rb_ary_push(lines, rb_enc_str_new(start + offset, length, scope_node->encoding));
    }
 
    // Push on the last line if we need to.
    if (last_push) {
        rb_ary_push(lines, rb_enc_str_new(start + last_offset, end - (start + last_offset), scope_node->encoding));
    }
 
    return lines;
}
 
struct load_from_fd_args {
    VALUE path;
    VALUE io;
    int open_mode;
    int fd;
};
 
static VALUE
close_file(VALUE args)
{
    struct load_from_fd_args *arg = (void *)args;
    if (arg->fd != -1) {
        close(arg->fd);
    }
    else if (!NIL_P(arg->io)) {
        rb_io_close(arg->io);
    }
    return Qnil;
}
 
static VALUE
load_content(VALUE args)
{
    struct load_from_fd_args *arg = (void *)args;
    VALUE io = rb_io_fdopen(arg->fd, arg->open_mode, RSTRING_PTR(arg->path));
    arg->io = io;
    arg->fd = -1;
    rb_io_wait(io, RB_INT2NUM(RUBY_IO_READABLE), Qnil);
    return rb_funcall(io, rb_intern("read"), 0);
}
 
VALUE
pm_load_file(pm_parse_result_t *result, VALUE filepath, bool load_error)
{
    pm_source_init_result_t init_result;
    result->source = pm_source_mapped_new(RSTRING_PTR(filepath), O_RDONLY | O_NONBLOCK, &init_result);
 
    if (init_result == PM_SOURCE_INIT_SUCCESS) {
        pm_options_frozen_string_literal_init(result->options);
        return Qnil;
    }
 
    int err;
 
    // For non-regular files (pipes, character devices), we need to read
    // through Ruby IO to properly release the GVL while waiting for data.
    if (init_result == PM_SOURCE_INIT_ERROR_NON_REGULAR) {
        struct load_from_fd_args args = {
            .path = filepath,
            .open_mode = O_RDONLY | O_NONBLOCK,
            .fd = rb_cloexec_open(RSTRING_PTR(filepath), args.open_mode, 0),
            .io = Qnil,
        };
        if (args.fd == -1) goto error_generic;
        VALUE contents = rb_ensure(load_content, (VALUE)&args, close_file, (VALUE)&args);
 
        if (!RB_TYPE_P(contents, T_STRING)) goto error_generic;
 
        long len = RSTRING_LEN(contents);
        if (len < 0) goto error_generic;
 
        size_t length = (size_t) len;
        uint8_t *source_data = xmalloc(length);
        memcpy(source_data, RSTRING_PTR(contents), length);
        result->source = pm_source_owned_new(source_data, length);
 
        pm_options_frozen_string_literal_init(result->options);
        return Qnil;
    }
 
    if (init_result == PM_SOURCE_INIT_ERROR_DIRECTORY) {
        err = EISDIR;
    } else {
error_generic:
#ifdef _WIN32
        err = rb_w32_map_errno(GetLastError());
#else
        err = errno;
#endif
    }
 
    VALUE error;
    if (load_error) {
        VALUE message = rb_str_buf_new_cstr(strerror(err));
        rb_str_cat2(message, " -- ");
        rb_str_append(message, filepath);
 
        error = rb_exc_new3(rb_eLoadError, message);
        rb_ivar_set(error, rb_intern_const("@path"), filepath);
    } else {
        error = rb_syserr_new_str(err, filepath);
    }
 
    return error;
}
 
VALUE
pm_parse_file(pm_parse_result_t *result, VALUE filepath, VALUE *script_lines)
{
    result->node.filepath_encoding = rb_enc_get(filepath);
    pm_options_filepath_set(result->options, RSTRING_PTR(filepath));
    RB_GC_GUARD(filepath);
 
    pm_options_version_for_current_ruby_set(result->options);
 
    result->parser = pm_parser_new(result->arena, pm_source_source(result->source), pm_source_length(result->source), result->options);
    pm_node_t *node = pm_parse(result->parser);
 
    VALUE error = pm_parse_process(result, node, script_lines);
 
    // If we're parsing a filepath, then we need to potentially support the
    // SCRIPT_LINES__ constant, which can be a hash that has an array of lines
    // of every read file.
    ID id_script_lines = rb_intern("SCRIPT_LINES__");
 
    if (rb_const_defined_at(rb_cObject, id_script_lines)) {
        VALUE constant_script_lines = rb_const_get_at(rb_cObject, id_script_lines);
 
        if (RB_TYPE_P(constant_script_lines, T_HASH)) {
            rb_hash_aset(constant_script_lines, filepath, pm_parse_file_script_lines(&result->node, result->parser));
        }
    }
 
    return error;
}
 
VALUE
pm_load_parse_file(pm_parse_result_t *result, VALUE filepath, VALUE *script_lines)
{
    VALUE error = pm_load_file(result, filepath, false);
    if (NIL_P(error)) {
        error = pm_parse_file(result, filepath, script_lines);
    }
 
    return error;
}
 
VALUE
pm_parse_string(pm_parse_result_t *result, VALUE source, VALUE filepath, VALUE *script_lines)
{
    rb_encoding *encoding = rb_enc_get(source);
    if (!rb_enc_asciicompat(encoding)) {
        return rb_exc_new_cstr(rb_eArgError, "invalid source encoding");
    }
 
    pm_options_frozen_string_literal_init(result->options);
    result->source = pm_source_constant_new((const uint8_t *) RSTRING_PTR(source), (size_t) RSTRING_LEN(source));
    pm_options_encoding_set(result->options, rb_enc_name(encoding));
 
    result->node.filepath_encoding = rb_enc_get(filepath);
    pm_options_filepath_set(result->options, RSTRING_PTR(filepath));
 
    pm_options_version_for_current_ruby_set(result->options);
 
    result->parser = pm_parser_new(result->arena, pm_source_source(result->source), pm_source_length(result->source), result->options);
    pm_node_t *node = pm_parse(result->parser);
 
    VALUE error = pm_parse_process(result, node, script_lines);
 
    RB_GC_GUARD(source);
    RB_GC_GUARD(filepath);
    return error;
}
 
typedef struct {
    uint32_t node_id;
    const pm_node_t *node;
} pm_node_find_context_t;
 
static bool
pm_node_find(const pm_node_t *node, void *data)
{
    pm_node_find_context_t *context = data;
 
    if (context->node == NULL && node->node_id == context->node_id) {
        context->node = node;
        return false;
    }
 
    return context->node == NULL;
}
 
bool
pm_node_source_location(VALUE source, VALUE filepath, int start_line,
                        int node_id, rb_code_location_t *location)
{
    pm_parse_result_t result;
    pm_parse_result_init(&result);
 
    pm_options_line_set(result.options, start_line);
    VALUE error = pm_parse_string(&result, source, filepath, NULL);
 
    if (!NIL_P(error)) {
        pm_parse_result_free(&result);
        rb_exc_raise(error);
    }
 
    pm_node_find_context_t context = {
        .node_id = (uint32_t) node_id,
        .node = NULL
    };
    pm_visit_node(result.node.ast_node, pm_node_find, &context);
 
    bool found = context.node != NULL;
    if (found) {
        *location = pm_code_location(&result.node, context.node);
    }
 
    RB_GC_GUARD(source);
    RB_GC_GUARD(filepath);
 
    pm_parse_result_free(&result);
    return found;
}
 
VALUE rb_io_gets_limit_internal(VALUE io, long limit);
 
static int
pm_parse_stdin_eof(void *stream)
{
    return RTEST(rb_io_eof((VALUE) stream));
}
 
#define MAX_ENC_LEN 6
 
static char *
pm_parse_stdin_fgets(char *string, int size, void *stream)
{
    RUBY_ASSERT(size > MAX_ENC_LEN);
 
    /*
     * Request fewer bytes than the buffer can hold. Ruby's line reader may
     * return more bytes than requested when the limit falls in the middle of a
     * multi-byte character, and the reserved headroom guarantees the result
     * still fits.
     */
    VALUE line = rb_io_gets_limit_internal((VALUE) stream, size - MAX_ENC_LEN);
    if (NIL_P(line)) {
        return NULL;
    }
 
    const char *cstr = RSTRING_PTR(line);
    long length = RSTRING_LEN(line);
 
    /*
     * Defensively clamp the copy. The line reader relaxes the limit to avoid
     * splitting a multi-byte character, so the returned string can be longer
     * than requested; we must never write past the caller's buffer. One byte
     * is reserved for the NUL terminator.
     */
    if (length > (long) (size - 1)) {
        length = (long) (size - 1);
    }
 
    memcpy(string, cstr, (size_t) length);
    string[length] = '\0';
 
    return string;
}
 
#undef MAX_ENC_LEN
 
// We need access to this function when we're done parsing stdin.
void rb_reset_argf_lineno(long n);
 
VALUE
pm_parse_stdin(pm_parse_result_t *result)
{
    pm_options_frozen_string_literal_init(result->options);
 
    result->source = pm_source_stream_new((void *) rb_stdin, pm_parse_stdin_fgets, pm_parse_stdin_eof);
    pm_node_t *node = pm_parse_stream(&result->parser, result->arena, result->source, result->options);
 
    // When we're done parsing, we reset $. because we don't want the fact that
    // we went through an IO object to be visible to the user.
    rb_reset_argf_lineno(0);
 
    return pm_parse_process(result, node, NULL);
}
 
#define PM_VERSION_FOR_RELEASE(major, minor) PM_VERSION_FOR_RELEASE_IMPL(major, minor)
#define PM_VERSION_FOR_RELEASE_IMPL(major, minor) #major "." #minor
 
void pm_options_version_for_current_ruby_set(pm_options_t *options) {
    const char *version = PM_VERSION_FOR_RELEASE(RUBY_API_VERSION_MAJOR, RUBY_API_VERSION_MINOR);
    pm_options_version_set(options, version, strlen(version));
}
 
#undef NEW_ISEQ
#define NEW_ISEQ OLD_ISEQ
 
#undef NEW_CHILD_ISEQ
#define NEW_CHILD_ISEQ OLD_CHILD_ISEQ