revert r54276 because of incompatibility.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@54287 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
revert r54276 because of incompatibility.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@54287 b2dd03c8-39d4-4d8f-98ff-823fe69b080e