[issue5837] support.EnvironmentVarGuard broken

[Mark Dickinson]

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

Is efficiency a concern here?  I'm just imagining an environment with 
thousands of variables, but only a few changes being made---the old 
(broken) code just resets the variables that have changed, while the 
patched version resets all of the variables.

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nosy: +marketdickinson

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5837>
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