* class.c (clone_method): use rb_copy_node_scope.
	  fixed [ruby-list:45102]
	  fixed [ruby-core:17393]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@17626 b2dd03c8-39d4-4d8f-98ff-823fe69b080e