[issue5837] support.EnvironmentVarGuard broken

[Mark Dickinson]

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

Could you maybe get away with a single dict "changed",
which would just record previous values (with None representing
a value that was previously unset)?

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