git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@22747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r22655,r22658,r22660 and r22661 from trunk into ruby_1_9_1.¶
platform disallows to open directories, e.g. cygwin.
[ruby-dev:38097], [Bug #1221]
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@22747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e