Issue #1717: rename tp_compare to tp_reserved.  I'll change the
type of tp_compare in a separate commit, for ease of reversion
should things go wrong.
diff --git a/Objects/sliceobject.c b/Objects/sliceobject.c
index fbf0955..ed3f520 100644
--- a/Objects/sliceobject.c
+++ b/Objects/sliceobject.c
@@ -31,7 +31,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	ellipsis_repr,			/* tp_repr */
 	0,				/* tp_as_number */
 	0,				/* tp_as_sequence */
@@ -352,7 +352,7 @@
 	0,					/* tp_print */
 	0,					/* tp_getattr */
 	0,					/* tp_setattr */
-	0,			 		/* tp_compare */
+	0,			 		/* tp_reserved */
 	(reprfunc)slice_repr,   		/* tp_repr */
 	0,					/* tp_as_number */
 	0,	    				/* tp_as_sequence */