Issue #7414 has been updated by nobu (Nobuyoshi Nakada). I vote for false in both cases, like defined? operator. ---------------------------------------- Feature #7414: Now that const_get supports "Foo::Bar" syntax, so should const_defined?. https://bugs.ruby-lang.org/issues/7414#change-35288 Author: robertgleeson (Robert Gleeson) Status: Assigned Priority: Normal Assignee: tenderlovemaking (Aaron Patterson) Category: Target version: 2.0.0 class Foo end Object.const_get "Object::Foo" => Foo Object.const_defined? "Object::Foo" => NameError (expected true). -- http://bugs.ruby-lang.org/