parse.y: no return in class
parse.y: no return in class

* parse.y (k_return): prohibit return in class/module body except
  for singleton class.

git-svn-id: ab86ecd26fe50a6a239cacb71380e346f71cee7d@60790 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ruby/rubyspec,eregon/rubyspec,nobu/rubyspec,nobu/rubyspec,ruby/rubyspec,ruby/spec,ruby/spec,eregon/rubyspec,eregon/rubyspec,nobu/rubyspec,ruby/spec