Issue #6695: Full garbage collection runs now clear the freelist of set objects.
Initial patch by Matthias Troffaes.
diff --git a/Include/setobject.h b/Include/setobject.h
index 6234111..00e5344 100644
--- a/Include/setobject.h
+++ b/Include/setobject.h
@@ -99,6 +99,8 @@
 PyAPI_FUNC(PyObject *) PySet_Pop(PyObject *set);
 #ifndef Py_LIMITED_API
 PyAPI_FUNC(int) _PySet_Update(PyObject *set, PyObject *iterable);
+
+PyAPI_FUNC(int) PySet_ClearFreeList(void);
 #endif
 
 #ifdef __cplusplus