bpo-43977: Use tp_flags for collection matching (GH-25723)
* Add Py_TPFLAGS_SEQUENCE and Py_TPFLAGS_MAPPING, add to all relevant standard builtin classes.
* Set relevant flags on collections.abc.Sequence and Mapping.
* Use flags in MATCH_SEQUENCE and MATCH_MAPPING opcodes.
* Inherit Py_TPFLAGS_SEQUENCE and Py_TPFLAGS_MAPPING.
* Add NEWS
* Remove interpreter-state map_abc and seq_abc fields.
diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 89c393c..6b1ab74 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -918,7 +918,7 @@ PyTypeObject PyTuple_Type = {
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TUPLE_SUBCLASS |
- _Py_TPFLAGS_MATCH_SELF, /* tp_flags */
+ _Py_TPFLAGS_MATCH_SELF | Py_TPFLAGS_SEQUENCE, /* tp_flags */
tuple_new__doc__, /* tp_doc */
(traverseproc)tupletraverse, /* tp_traverse */
0, /* tp_clear */