Issue #7993 has been updated by nobu (Nobuyoshi Nakada). Backport set to 1.9.3: DONTNEED, 2.0.0: REQUIRED ---------------------------------------- Bug #7993: owner of methods defined after using Module#prepend https://bugs.ruby-lang.org/issues/7993#change-43733 Author: no6v (Nobuhiro IMAI) Status: Closed Priority: Normal Assignee: Category: core Target version: ruby -v: RUBY_DESCRIPTION # => "ruby 2.1.0dev (2013-03-01 trunk 39546) [x86_64-linux]" Backport: 1.9.3: DONTNEED, 2.0.0: REQUIRED =begin The owner of methods defined after using Module#prepend seems to be incorrect. RUBY_DESCRIPTION # => "ruby 2.1.0dev (2013-03-01 trunk 39546) [x86_64-linux]" class C attr_reader :a prepend Module.new attr_reader :b end C.instance_method(:a).owner # => C C.instance_method(:b).owner # => #<C:0x00000000a52300> C.new.method(:a).owner # => C C.new.method(:b).owner # => #<C:0x00000000a52300> module M attr_reader :a prepend Module.new attr_reader :b end M.instance_method(:a).owner # => M M.instance_method(:b).owner # => # ~> -:19:in `<main>': undefined method `class' for #<M:0x00000000a515b8> (NoMethodError) =end -- http://bugs.ruby-lang.org/