From: "Hanmac (Hans Mackowiak)" Date: 2013-01-15T15:56:04+09:00 Subject: [ruby-core:51443] [ruby-trunk - Bug #7700][Open] Assignment to an Constant does not give an singleton_class its name Issue #7700 has been reported by Hanmac (Hans Mackowiak). ---------------------------------------- Bug #7700: Assignment to an Constant does not give an singleton_class its name https://bugs.ruby-lang.org/issues/7700 Author: Hanmac (Hans Mackowiak) Status: Open Priority: Low Assignee: Category: Target version: ruby -v: ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] object = Object.new ABC = object.singleton_class class ABC module D end end class << object module E end end p ABC #=> #> p ABC::D #=> ABC::D p ABC::E #=> ABC::E as you guys can see, and module into an singleton class get its right name, but the singleton_class itself does not get its name -- http://bugs.ruby-lang.org/