Remove the simple slicing API. All slicing is now done with slice objects.
diff --git a/Objects/structseq.c b/Objects/structseq.c
index a3ff045..1b6aafd 100644
--- a/Objects/structseq.c
+++ b/Objects/structseq.c
@@ -340,7 +340,7 @@
(binaryfunc)structseq_concat, /* sq_concat */
(ssizeargfunc)structseq_repeat, /* sq_repeat */
(ssizeargfunc)structseq_item, /* sq_item */
- (ssizessizeargfunc)structseq_slice, /* sq_slice */
+ 0, /* sq_slice */
0, /* sq_ass_item */
0, /* sq_ass_slice */
(objobjproc)structseq_contains, /* sq_contains */