--- a/mercurial/cext/revlog.c	Tue Apr 21 16:02:23 2015 -0400
+++ b/mercurial/cext/revlog.c	Mon Oct 16 14:49:35 2017 -0400
@@ -1991,7 +1991,7 @@
 };
 
 static PyTypeObject indexType = {
-	PyVarObject_HEAD_INIT(NULL, 0)
+	PyVarObject_HEAD_INIT(NULL, 0) /* header */
 	"parsers.index",           /* tp_name */
 	sizeof(indexObject),       /* tp_basicsize */
 	0,                         /* tp_itemsize */