Issue #1603 has been updated by _ wanabe.

Category set to test
Target version changed from 1.9.1 to 1.9.x

Because Shellwords doesn't support Windows, Nobu said.
Supporting Windows is ideal. But now in the feature-freeze phase.
I'll change the test, skip on Windows (mswin/mingw).
A test-case without Shellwords is welcome.
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http://redmine.ruby-lang.org/issues/show/1603

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