Ruby 2.3.0 リファレンスマニュアル > ライブラリ一覧 > rubygems/dependency_listライブラリ > Gem::DependencyListクラス > spec_predecessors
spec_predecessors -> Hash
[permalink][rdoc][TODO] ???
Return a hash of predecessors. <tt>result[spec]</tt> is an Array of gemspecs that have a dependency satisfied by the named spec.