python
diff --git a/‎Python/importdl.c
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+7Lines changed: 7 additions & 0 deletions b/‎Python/importdl.c
Copy file name to clipboardExpand all lines: Python/importdl.c
+7Lines changed: 7 additions & 0 deletions
@@ -426,6 +426,11 @@ _PyImport_RunModInitFunc(PyModInitFunction p0,
     /* Validate the result (and populate "res". */
 
     if (m == NULL) {
+        /* The init func for multi-phase init modules is expected
+         * to return a PyModuleDef after calling PyModuleDef_Init().
+         * That function never raises an exception nor returns NULL,
+         * so at this point it must be a single-phase init modules. */
+        res.kind = _Py_ext_module_kind_SINGLEPHASE;
         if (PyErr_Occurred()) {
             _Py_ext_module_loader_result_set_error(
                         &res, _Py_ext_module_loader_result_EXCEPTION);
@@ -436,6 +441,8 @@ _PyImport_RunModInitFunc(PyModInitFunction p0,
         }
         goto error;
     } else if (PyErr_Occurred()) {
+        /* Likewise, we infer that this is a single-phase init module. */
+        res.kind = _Py_ext_module_kind_SINGLEPHASE;
         _Py_ext_module_loader_result_set_error(
                 &res, _Py_ext_module_loader_result_ERR_UNREPORTED_EXC);
         /* We would probably be correct to decref m here,