Use ruby_bug now that a bug is filed
Use ruby_bug now that a bug is filed

* So other implementations use the right behavior from the start.

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