bpo-42128: __match_args__ can't be a list anymore (GH-25203)
diff --git a/Python/ceval.c b/Python/ceval.c
index b9d784a..d9a754f 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1029,15 +1029,8 @@ match_class(PyThreadState *tstate, PyObject *subject, PyObject *type,
int match_self = 0;
match_args = PyObject_GetAttrString(type, "__match_args__");
if (match_args) {
- if (PyList_CheckExact(match_args)) {
- Py_SETREF(match_args, PyList_AsTuple(match_args));
- }
- if (match_args == NULL) {
- goto fail;
- }
if (!PyTuple_CheckExact(match_args)) {
- const char *e = "%s.__match_args__ must be a list or tuple "
- "(got %s)";
+ const char *e = "%s.__match_args__ must be a tuple (got %s)";
_PyErr_Format(tstate, PyExc_TypeError, e,
((PyTypeObject *)type)->tp_name,
Py_TYPE(match_args)->tp_name);