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

[Antoine Pitrou]

Antoine Pitrou added the comment:

Le 05/09/2017 à 19:10, STINNER Victor a écrit :
> 
> Maybe the default implementation of the macro should be:
> 
> #define Py_UNREACHABLE(stmt) abort(); stmt

Or simply you would write:

    Py_UNREACHABLE();
    return NULL;

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