[issue18659] test_precision in test_format.py is not executed and has unused variable

[STINNER Victor]

STINNER Victor added the comment:

I realized that the new tests checking that precision larger with
INT_MAX fail should be marked as specific to CPython. The import of
_testcapi should be moved to a CPython specific test.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18659>
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