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Description
It appears that if you create an extension type that derives PyGenericArrType and doesn't define nb_int, NumPy crashes when calling int() on an instance of your type.
This is straightforward to demonstrate with test_rational.c: replace pyrational_int with 0 on line 631 when defining nb_int. Then,
from numpy.core.test_rational import rational
r = rational(2, 3)
int(r)This results in an infinite recursion. On OS/X, this is the bottom of the stack.
frame #262073: 0x000000010000dfeb python`PyNumber_Long + 123
frame #262074: 0x0000000103154c3e multiarray.cpython-36m-darwin.so`array_int + 78
frame #262075: 0x0000000103163eba multiarray.cpython-36m-darwin.so`gentype_int + 42
frame #262076: 0x000000010006ccd4 python`_PyLong_FromNbInt + 52
frame #262077: 0x000000010000dfeb python`PyNumber_Long + 123
frame #262078: 0x0000000103154c3e multiarray.cpython-36m-darwin.so`array_int + 78
frame #262079: 0x0000000103163eba multiarray.cpython-36m-darwin.so`gentype_int + 42
frame #262080: 0x000000010006ccd4 python`_PyLong_FromNbInt + 52
frame #262081: 0x000000010000dfeb python`PyNumber_Long + 123
frame #262082: 0x000000010006059b python`long_new + 139
frame #262083: 0x00000001000b74ef python`type_call + 47
frame #262084: 0x0000000100009df1 python`_PyObject_FastCallDict + 177
frame #262085: 0x0000000100163348 python`call_function + 392
frame #262086: 0x0000000100160f4c python`_PyEval_EvalFrameDefault + 47100
frame #262087: 0x0000000100154589 python`_PyEval_EvalCodeWithName + 425
frame #262088: 0x00000001001ac63c python`PyRun_FileExFlags + 252
frame #262089: 0x00000001001abdee python`PyRun_SimpleFileExFlags + 366
frame #262090: 0x00000001001d1dd6 python`Py_Main + 3718
frame #262091: 0x0000000100001e7d python`main + 509
frame #262092: 0x00007fff4f91c145 libdyld.dylib`start + 1
frame #262093: 0x00007fff4f91c145 libdyld.dylib`start + 1
If the type doesn't subclass PyGenericArrType, this does not appear to occur.
Similar failure and similar stack trace on Linux/GCC/gdb.
Tested on 1.14, 1.13, 1.12 (the latter has a different stack trace) with Python 3.