[issue30764] regrtest: Add --fail-env-changed option

[STINNER Victor]

STINNER Victor added the comment:


New changeset 849b062a82ca2f09e33259d34067faba196c9e23 by Victor Stinner in branch '3.5':
bpo-30764: test_subprocess uses SuppressCrashReport (#2405) (#2411)
https://github.com/python/cpython/commit/849b062a82ca2f09e33259d34067faba196c9e23


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<http://bugs.python.org/issue30764>
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