[issue5837] support.EnvironmentVarGuard broken

[Walter Dörwald <report@bugs.python.org> at psf.upfronthosting.co.za]

Walter Dörwald <walter at livinglogic.de> added the comment:

That's exactly what I was thinking too. Here's the patch. Running the
test suite now.

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Added file: http://bugs.python.org/file13764/diff2.txt

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