[issue5837] support.EnvironmentVarGuard broken

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Patch looks good to me, and (for py3k) all tests pass on my machine.

As far as I can tell, there's currently no test for EvironmentVarGuard 
itself, though it's tested indirectly by other tests.  It might be good to 
have some direct tests (including one for the broken behaviour you found).

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<http://bugs.python.org/issue5837>
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