2 files changed, 36 insertions, 2 deletions
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 587dad3..06cc4a8 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -1175,6 +1175,24 @@ dict_fromkeys(PyObject *cls, PyObject *args)
 	if (d == NULL)
 		return NULL;
 
+	if (PyDict_CheckExact(d) && PyAnySet_CheckExact(seq)) {
+		dictobject *mp = (dictobject *)d;
+		Py_ssize_t pos = 0;
+		PyObject *key;
+		long hash;
+
+		if (dictresize(mp, PySet_GET_SIZE(seq)))
+			return NULL;
+
+		while (_PySet_NextEntry(seq, &pos, &key, &hash)) {
+			Py_INCREF(key);
+			Py_INCREF(Py_None);
+			if (insertdict(mp, key, hash, Py_None))
+				return NULL;
+		}
+		return d;
+	}
+
 	it = PyObject_GetIter(seq);
 	if (it == NULL){
 		Py_DECREF(d);
diff --git a/Objects/setobject.c b/Objects/setobject.c
index 07ba996..a896d93 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2137,7 +2137,7 @@ PySet_Add(PyObject *set, PyObject *key)
 }
 
 int
-_PySet_Next(PyObject *set, Py_ssize_t *pos, PyObject **entry)
+_PySet_Next(PyObject *set, Py_ssize_t *pos, PyObject **key)
 {
 	setentry *entry_ptr;
 
@@ -2147,7 +2147,23 @@ _PySet_Next(PyObject *set, Py_ssize_t *pos, PyObject **entry)
 	}
 	if (set_next((PySetObject *)set, pos, &entry_ptr) == 0)
 		return 0;
-	*entry = entry_ptr->key;
+	*key = entry_ptr->key;
+	return 1;
+}
+
+int
+_PySet_NextEntry(PyObject *set, Py_ssize_t *pos, PyObject **key, long *hash)
+{
+	setentry *entry;
+
+	if (!PyAnySet_Check(set)) {
+		PyErr_BadInternalCall();
+		return -1;
+	}
+	if (set_next((PySetObject *)set, pos, &entry) == 0)
+		return 0;
+	*key = entry->key;
+	*hash = entry->hash;
 	return 1;
 }