Issue #9779 has been updated by shugo (Shugo Maeda). I've added specs to the pull request: https://github.com/ruby/ruby/pull/17807/changes/ed81db60a57ec586d4c5300282bc... ---------------------------------------- Feature #9779: Add Module#descendants https://bugs.ruby-lang.org/issues/9779#change-118296 * Author: shugo (Shugo Maeda) * Status: Open ---------------------------------------- Now classes have links to their subclasses, so how about to add Module#descendents? ```ruby class X end class Y < X end class Z < Y end p X.descendents #=> [X, Y, Z] module A end module B include A end module C include A end p A.descendents #=> [A, C, B] ``` One of my own use cases is to implement AspectJ like pointcut which matches all subclasses of the given class. Considerations: * Should the return value of Module#descendents include self? * Should the return value of Module#descendents include singleton classes? I attach a patch, where the return value includes both self and singleton classes. ---Files-------------------------------- 0001-Add-Module-descendents.patch (3.75 KB) -- https://bugs.ruby-lang.org/