Give the internal immutable list type .extend and .pop methods (they
"should have" been added here when they were added to lists).
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 22f7e5e..2b6207f 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -1727,6 +1727,8 @@
static PyMethodDef immutable_list_methods[] = {
{"append", (PyCFunction)immutable_list_op, METH_VARARGS},
{"insert", (PyCFunction)immutable_list_op, METH_VARARGS},
+ {"extend", (PyCFunction)immutable_list_op, METH_O},
+ {"pop", (PyCFunction)immutable_list_op, METH_VARARGS},
{"remove", (PyCFunction)immutable_list_op, METH_VARARGS},
{"index", (PyCFunction)listindex, METH_O},
{"count", (PyCFunction)listcount, METH_O},