Merge branch '0.29.x'

Cython/Utility/ObjectHandling.c

@@ -1393,7 +1393,7 @@ static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
 /////////////// CallableCheck.proto ///////////////
 
 #if CYTHON_USE_TYPE_SLOTS && PY_MAJOR_VERSION >= 3
-#define __Pyx_PyCallable_Check(obj)   ((obj)->ob_type->tp_call != NULL)
+#define __Pyx_PyCallable_Check(obj)   (Py_TYPE(obj)->tp_call != NULL)
 #else
 #define __Pyx_PyCallable_Check(obj)   PyCallable_Check(obj)
 #endif