class.c: suppress wrong warning
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40013 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
class.c: suppress wrong warning
instance variable to get rid of wrong warning about attached.
[ruby-core:53839] [Bug #8188]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40013 b2dd03c8-39d4-4d8f-98ff-823fe69b080e