[issue37473] importlib: Remove libregrtest hack: "We import importlib *ASAP* in order to test #15386"

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I merged your PR. If someone considers than test_there_can_be_only_one() is not enough, please add a new test.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<https://bugs.python.org/issue37473>
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