[Bug c/92063] [10 Regression] ICE in operation_could_trap_p, at tree-eh.c:2528 when compiling Python's Python/_warnings.c

[romain.geissler at amadeus dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92063

--- Comment #1 from Romain Geissler <romain.geissler at amadeus dot com> ---
Python code is here:

https://github.com/python/cpython/blob/v3.7.4/Python/_warnings.c#L753

#define ascii_lower(c) ((c <= 127) ? Py_TOLOWER(c) : 0)
        /* if filename.lower().endswith(".pyc"): */
        if (len >= 4 &&
            PyUnicode_READ(kind, data, len-4) == '.' &&
            ascii_lower(PyUnicode_READ(kind, data, len-3)) == 'p' &&
            ascii_lower(PyUnicode_READ(kind, data, len-2)) == 'y' &&
            ascii_lower(PyUnicode_READ(kind, data, len-1)) == 'c')
        {
            *filename = PyUnicode_Substring(*filename, 0,
                                            PyUnicode_GET_LENGTH(*filename)-1);
            if (*filename == NULL)
                goto handle_error;
        }
        else
            Py_INCREF(*filename);