fixed warning of 'ruby -w' git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8326 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8324 b2dd03c8-39d4-4d8f-98ff-823fe69b080e