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/xxmodule.c b/Modules/xxmodule.c
index 602cdfe..a31341c 100644
--- a/Modules/xxmodule.c
+++ b/Modules/xxmodule.c
@@ -106,7 +106,7 @@
 	0,			/*tp_print*/
 	(getattrfunc)0,         /*tp_getattr*/
 	(setattrfunc)Xxo_setattr, /*tp_setattr*/
-	0,			/*tp_compare*/
+	0,			/*tp_reserved*/
 	0,			/*tp_repr*/
 	0,			/*tp_as_number*/
 	0,			/*tp_as_sequence*/
@@ -224,7 +224,7 @@
 	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*/
@@ -279,7 +279,7 @@
 	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*/