Add invariant check

johnslavik · johnslavik · commit a23d40e9adc6 · 2026-02-27T21:27:09.000+01:00
diff --git a/Python/import.c b/Python/import.c
@@ -4502,6 +4502,7 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,
             modname = Py_NewRef(Py_None);
         }
         if (fromlist == NULL) {
+            assert(!PyErr_Occurred());
             fromlist = Py_NewRef(Py_None);
         }
         PyObject *args[] = {modname, name, fromlist};

Original file line number	Diff line number	Diff line change
`@@ -4502,6 +4502,7 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,`
`4502`	`4502`	`modname = Py_NewRef(Py_None);`
`4503`	`4503`	`}`
`4504`	`4504`	`if (fromlist == NULL) {`
	`4505`	`+ assert(!PyErr_Occurred());`
`4505`	`4506`	`fromlist = Py_NewRef(Py_None);`
`4506`	`4507`	`}`
`4507`	`4508`	`PyObject *args[] = {modname, name, fromlist};`