Avoid accessing "PyGenObject->gi_code", which was removed in CPython 3.12a6 and replaced with a C-API function.

scoder · scoder · commit d5c014f63d42 · 2023-03-31T14:19:17.000+02:00
See python/cpython#100749
diff --git a/Cython/Utility/Coroutine.c b/Cython/Utility/Coroutine.c
@@ -178,7 +178,11 @@ static PyObject *__Pyx__Coroutine_GetAwaitableIter(PyObject *obj) {
     } else
 #endif
 #if CYTHON_COMPILING_IN_CPYTHON && defined(CO_ITERABLE_COROUTINE)
+#if PY_VERSION_HEX >= 0x030C00A6
+    if (PyGen_CheckExact(obj) && (PyGen_GetCode(obj)->co_flags & CO_ITERABLE_COROUTINE)) {
+#else
     if (PyGen_CheckExact(obj) && ((PyGenObject*)obj)->gi_code && ((PyCodeObject *)((PyGenObject*)obj)->gi_code)->co_flags & CO_ITERABLE_COROUTINE) {
+#endif
         // Python generator marked with "@types.coroutine" decorator
         return __Pyx_NewRef(obj);
     } else
