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check_recursion_depth.py: script using Python functions and C function (functools.partial) to check the recursion depth.
Example with Python 3.6:
haypo@selma$ ./python check_recursion_depth.py # unpatched
got: 148, expected: 100
haypo@selma$ ./python check_recursion_depth.py # patched
got: 100, expected: 100
Maybe we need "proxies" in _testcapi for each kind of function, a function taking a callback and calling this function. Function types:
* C function, METH_NOARGS
* C function, METH_O
* C function, METH_VARRGS
* C function, METH_VARRGS | METH_KEYWORDS
* C function, METH_FASTCALL
* Python function
* Maybe even most common C functions to call functions: PyObject_Call(), _PyObject_FastCallDict(), _PyObject_FastCallKeywords(), etc.