NEWS for Ruby 4.1.0

This document is a list of user-visible feature changes since the 4.0.0 release, except for bug fixes.

Note that each entry is kept to a minimum, see links for details.

Language changes

Core classes updates

Note: We’re only listing outstanding class updates.

• Method

  • Method#source_location, Proc#source_location, and UnboundMethod#source_location now return extended location information with 5 elements: [path, start_line, start_column, end_line, end_column]. The previous 2-element format [path, line] can still be obtained by calling .take(2) on the result. [Feature #6012]

• Set

  • A deprecated behavior, Set#to_set, Range#to_set, and Enumerable#to_set accepting arguments, was removed. [Feature #21390]

Stdlib updates

We only list stdlib changes that are notable feature changes.

Other changes are listed in the following sections. We also listed release history from the previous bundled version that is Ruby 3.4.0 if it has GitHub releases.

The following bundled gems are promoted from default gems.

The following default gem is added.

The following default gems are updated.

• RubyGems 4.1.0.dev

• bundler 4.1.0.dev

• stringio 3.2.1.dev

• strscan 3.1.7.dev

The following bundled gems are updated.

• minitest 6.0.1

• test-unit 3.7.7

• rss 0.3.2

• net-imap 0.6.2

• typeprof 0.31.1

• debug 1.11.1

• mutex_m 0.3.0

• rdoc 7.0.3

RubyGems and Bundler

Ruby 4.0 bundled RubyGems and Bundler version 4. see the following links for details.

Supported platforms

Compatibility issues

Stdlib compatibility issues

C API updates

Implementation improvements

Ractor

A lot of work has gone into making Ractors more stable, performant, and usable. These improvements bring Ractor implementation closer to leaving experimental status.

JIT