From: "marcandre (Marc-Andre Lafortune)" Date: 2012-06-24T03:20:52+09:00 Subject: [ruby-core:45806] [ruby-trunk - Feature #1586] Including a module already present in ancestors should not be ignored Issue #1586 has been updated by marcandre (Marc-Andre Lafortune). Has this feature been accepted by Matz? Or else, is anyone producing a one minute slide-show? ---------------------------------------- Feature #1586: Including a module already present in ancestors should not be ignored https://bugs.ruby-lang.org/issues/1586#change-27383 Author: bitsweat (Jeremy Kemper) Status: Assigned Priority: Normal Assignee: matz (Yukihiro Matsumoto) Category: core Target version: 2.0.0 =begin The scenario: * I include Foo in Numeric to provide #bar * Some other library includes a module in Float to provide #bar * So I include Foo in Float to use my #bar * But including Foo in Float is ignored since it's already in the ancestor chain I think it should be added to the ancestor chain, even if it's already present, since I may want to override some other method earlier in the ancestor chain. # Including a module already included in a superclass is ignored >> module Foo; end => nil >> class Numeric; include Foo; end => Numeric >> Float.ancestors => [Float, Precision, Numeric, Foo, Comparable, Object, Kernel] >> class Float; include Foo; end => Float >> Float.ancestors => [Float, Precision, Numeric, Foo, Comparable, Object, Kernel] # Reversing the order of inclusion works as expected >> module Foo; end => nil >> class Float; include Foo; end => Float >> Float.ancestors => [Float, Foo, Precision, Numeric, Comparable, Object, Kernel] >> class Numeric; include Foo; end => Numeric >> Float.ancestors => [Float, Foo, Precision, Numeric, Foo, Comparable, Object, Kernel] # And so does including a dupe of the existing module in the subclass >> module Foo; end => nil >> class Numeric; include Foo; end => Numeric >> Float.ancestors => [Float, Precision, Numeric, Foo, Comparable, Object, Kernel] >> class Float; include Foo.dup; end => Float >> Float.ancestors => [Float, #, Precision, Numeric, Foo, Comparable, Object, Kernel] =end -- http://bugs.ruby-lang.org/