[issue40704] PyIter_Check fails when compiling in the Limited API

[Maxwell Bernstein]

New submission from Maxwell Bernstein <tekk.nolagi at gmail.com>:

PyIter_Check is itself marked as available in the Limited API but:

a) it's a macro, and
b) it pokes directly at tp_iternext

This means that it's functionally impossible to use PyIter_Check
when working with the Limited API.

----------
components: C API
messages: 369479
nosy: tekknolagi
priority: normal
severity: normal
status: open
title: PyIter_Check fails when compiling in the Limited API
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40704>
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