object.c: no TypeError at special const clone
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56929 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
object.c: no TypeError at special const clone
special constants, and return itself instead. however, if
freeze option is false, raise an ArgumentError. [Feature#12979]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56929 b2dd03c8-39d4-4d8f-98ff-823fe69b080e