Issue #6454 has been updated by mame (Yusuke Endoh). Status changed from Open to Assigned Assignee set to matz (Yukihiro Matsumoto) Aaron, you'd better think we are really lazy :-) It would be good not only to attach a demonstration patch but also to write the demonstration in the mail. x = Class.new y = x.dup p x #=> #<Class:0x9a96ce0> p y #=> #<Class:0x9a96cb8> # they are different as expected, x = Class.new x.inspect # but if #inspect is called before #dup, y = x.dup p x #=> #<Class:0x9113c7c> p y #=> #<Class:0x9113c7c> # they become same. I give +1 to drbrain's patch. -- Yusuke Endoh <mame / tsg.ne.jp> ---------------------------------------- Bug #6454: Anonymous classes should delete tmp_classpath on dup https://bugs.ruby-lang.org/issues/6454#change-26741 Author: tenderlovemaking (Aaron Patterson) Status: Assigned Priority: Normal Assignee: matz (Yukihiro Matsumoto) Category: Target version: ruby -v: ruby 2.0.0dev (2012-05-19 trunk 35705) [x86_64-darwin11.4.0] When an anonymous class is duped, it should delete tmp_classpath from the iv table so that subsequent calls to `inspect` on the duped class will have different results. I've attached a test case to demonstrate the problem. -- http://bugs.ruby-lang.org/