STINNER Victor added the comment:

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.

----------
Added file: http://bugs.python.org/file46607/check_recursion_depth.py

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<http://bugs.python.org/issue29306>
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