git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30688 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r30595 from trunk into ruby_1_9_2.¶
no bytes are written to the buf. [ruby-dev:43062]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30688 b2dd03c8-39d4-4d8f-98ff-823fe69b080e