git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30264 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r29630 from trunk into ruby_1_9_2.¶
a patch from Yutaka HARA [ruby-core:32953] [Ruby 1.9-Bug#4001]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30264 b2dd03c8-39d4-4d8f-98ff-823fe69b080e