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-rw-r--r--Objects/setobject.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/Objects/setobject.c b/Objects/setobject.c
index 4cf47bd..c827434 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2173,7 +2173,8 @@ PySet_Discard(PyObject *set, PyObject *key)
int
PySet_Add(PyObject *anyset, PyObject *key)
{
- if (!PyAnySet_Check(anyset)) {
+ if (!PySet_Check(anyset) &&
+ (!PyFrozenSet_Check(anyset) || Py_REFCNT(anyset) != 1)) {
PyErr_BadInternalCall();
return -1;
}
@@ -2277,6 +2278,10 @@ test_c_api(PySetObject *so)
f = PyFrozenSet_New(dup);
assertRaises(PySet_Clear(f) == -1, PyExc_SystemError);
assertRaises(_PySet_Update(f, dup) == -1, PyExc_SystemError);
+ assert(PySet_Add(f, elem) == 0);
+ Py_INCREF(f);
+ assertRaises(PySet_Add(f, elem) == -1, PyExc_SystemError);
+ Py_DECREF(f);
Py_DECREF(f);
/* Exercise direct iteration */