PEP 0492 -- Coroutines with async and await syntax. Issue #24017.
diff --git a/Objects/typeslots.inc b/Objects/typeslots.inc
index 2ed99d8..bcbe0af 100644
--- a/Objects/typeslots.inc
+++ b/Objects/typeslots.inc
@@ -75,3 +75,6 @@
 offsetof(PyHeapTypeObject, ht_type.tp_free),
 offsetof(PyHeapTypeObject, as_number.nb_matrix_multiply),
 offsetof(PyHeapTypeObject, as_number.nb_inplace_matrix_multiply),
+offsetof(PyHeapTypeObject, as_async.am_await),
+offsetof(PyHeapTypeObject, as_async.am_aiter),
+offsetof(PyHeapTypeObject, as_async.am_anext),