[issue42500] crash with unbounded recursion in except statement

[Eric V. Smith]

Eric V. Smith <e...@trueblade.com> added the comment:

Here's the smallest reproducer I could come up with. It fails on Windows with 
3.9 native(compiled locally) (Fatal Python error: _Py_CheckRecursiveCall: 
Cannot recover from stack overflow), works (raises RecursionError) with cygwin 
3.8.3.

import os

def status():
    for fd in range(4):
        try:
            st = os.fstat(fd)
        except status() as e:
            pass

status()

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nosy: +eric.smith

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<https://bugs.python.org/issue42500>
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