[issue30892] _elementtree: assertion error if stdlib copy module is overriden

[STINNER Victor]

STINNER Victor added the comment:


New changeset 044e156426825acac8b6c6d1ce14d5b7bcb20bc9 by Victor Stinner in branch '3.6':
bpo-30892: Fix _elementtree module initialization (#2647) (#2649)
https://github.com/python/cpython/commit/044e156426825acac8b6c6d1ce14d5b7bcb20bc9


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