[issue27829] test.regrtest: changed environment variables are not logged

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2e23f7b9515c by Victor Stinner in branch 'default':
Issue #27829: libregrtest.save_env: flush stderr
https://hg.python.org/cpython/rev/2e23f7b9515c

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nosy: +python-dev

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<http://bugs.python.org/issue27829>
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