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

[STINNER Victor]

STINNER Victor added the comment:


New changeset 5e87592fd12e0b7c41edc11d4885ed7298d5063b by Victor Stinner in branch 'master':
bpo-30764: Fix regrtest --fail-env-changed --forever (#2536)
https://github.com/python/cpython/commit/5e87592fd12e0b7c41edc11d4885ed7298d5063b


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