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gh-94607: Fix subclassing generics (GH-94610)

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Co-authored-by: Serhiy Storchaka <3659035+serhiy-storchaka@users.noreply.github.com>
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Ken Jin 2022-07-09 12:18:01 +08:00 • committed by GitHub
parent 8a285df806
commit 6442a9dd21
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4 changed files with 38 additions and 0 deletions
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Objects/genericaliasobject.c
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@ -219,6 +219,10 @@ _Py_make_parameters(PyObject *args)
for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
PyObject *t = PyTuple_GET_ITEM(args, iarg);
PyObject *subst;
// We don't want __parameters__ descriptor of a bare Python class.
if (PyType_Check(t)) {
continue;
}
if (_PyObject_LookupAttr(t, &_Py_ID(__typing_subst__), &subst) < 0) {
Py_DECREF(parameters);
return NULL;