[issue23020] New matmul operator crashes modules compiled with CPython3.4

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

Here is a test module that segfaults on Python3.5.
It's derived from _testcapi, but it can be anything with a PyNumberMethods.

I compiled with
    gcc -g -I path/to/cpython3.4/Include/ -I /path/to/cpython3.4 mytest.c -fPIC 
--shared -o mytest.so

Then I ran python3.5 and:
    import mytest
    print(mytest.matmulType() @ 1)

When the module is compiled with 3.5, TypeError is correctly raised.

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Added file: http://bugs.python.org/file37397/mytest.c

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