[issue30695] add a nomemory_allocator to the _testcapi module

[Xavier de Gaye]

Xavier de Gaye <xdegaye at gmail.com> added the comment:

Test cases in issues #30697 and #30817, back ported to 3.6, need _testcapi.set_nomemory().

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versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30695>
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