Fix destructor dereferencing #53
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* fix segfault caused by passing destructed value to `cvector_free` with `cvector_destructor` * add unit test for dereferencing vector in cvector_destructor
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cvector_freewithcvector_destructorSo, the problem was caused by code resembling the following:
This code expands to:
This leads to an erroneous memory access and results in a segmentation fault.