[issue31338] Use abort() for code we never expect to hit

[STINNER Victor]

STINNER Victor added the comment:

> Or simply you would write:
>
>    Py_UNREACHABLE();
>     return NULL;

I recall that I had to fix warnings when using clang on:

Py_FatalError("...");
return NULL;

See bpo-28152.

I don't know if it's related to this issue.

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<http://bugs.python.org/issue31338>
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