From: "nobu (Nobuyoshi Nakada)" Date: 2012-05-24T14:56:14+09:00 Subject: [ruby-core:45204] [ruby-trunk - Feature #6478] BasicObject#__class__ Issue #6478 has been updated by nobu (Nobuyoshi Nakada). Seems what you want is dup, not __class__. class Foo < BasicObject mix ::Kernel, dup: :dup, clone: :clone end ---------------------------------------- Feature #6478: BasicObject#__class__ https://bugs.ruby-lang.org/issues/6478#change-26790 Author: trans (Thomas Sawyer) Status: Feedback Priority: Normal Assignee: matz (Yukihiro Matsumoto) Category: core Target version: 2.0.0 How else is one supposed to get the class of a subclass of BasicObject? -- http://bugs.ruby-lang.org/