git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@23779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r23657 from trunk into ruby_1_9_1.¶
[ruby-core:23767].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@23779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e