object.c: Module#singleton_class?
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42449 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
object.c: Module#singleton_class?
return whether the receiver is a singleton class or not.
[ruby-core:51087] [Feature #7609]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42449 b2dd03c8-39d4-4d8f-98ff-823fe69b080e