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/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 1b855e1..20f30f4 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -848,7 +848,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	deque_repr,			/* tp_repr */
 	0,				/* tp_as_number */
 	&deque_as_sequence,		/* tp_as_sequence */
@@ -978,7 +978,7 @@
 	0,					/* tp_print */
 	0,					/* tp_getattr */
 	0,					/* tp_setattr */
-	0,					/* tp_compare */
+	0,					/* tp_reserved */
 	0,					/* tp_repr */
 	0,					/* tp_as_number */
 	0,					/* tp_as_sequence */
@@ -1061,7 +1061,7 @@
 	0,					/* tp_print */
 	0,					/* tp_getattr */
 	0,					/* tp_setattr */
-	0,					/* tp_compare */
+	0,					/* tp_reserved */
 	0,					/* tp_repr */
 	0,					/* tp_as_number */
 	0,					/* tp_as_sequence */
@@ -1318,7 +1318,7 @@
 	0,				/* tp_print */
 	0,				/* tp_getattr */
 	0,				/* tp_setattr */
-	0,				/* tp_compare */
+	0,				/* tp_reserved */
 	(reprfunc)defdict_repr,		/* tp_repr */
 	0,				/* tp_as_number */
 	0,				/* tp_as_sequence */