[pypy-issue] Issue #2891: PyEval_GetFrame is unavailable in the C API (pypy/pypy)

[Hong]

New issue 2891: PyEval_GetFrame is unavailable in the C API
https://bitbucket.org/pypy/pypy/issues/2891/pyeval_getframe-is-unavailable-in-the-c

Hong:

While I understand that PyPy is stackless, this function is in the standard Python C API ([here](https://docs.python.org/3.5/c-api/reflection.html)) and may cause compilation errors. Do you think it's a better idea to have this function defined but it always returns NULL?