diff -r f3d394ea17db -r c0d411ea6639 mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c	Fri Jul 20 09:53:54 2018 -0700
+++ b/mercurial/cext/revlog.c	Fri Jul 20 10:02:05 2018 -0700
@@ -163,9 +163,6 @@
 		return nullentry;
 	}
 
-	if (pos < 0)
-		pos += length;
-
 	if (pos < 0 || pos >= length) {
 		PyErr_SetString(PyExc_IndexError, "revlog index out of range");
 		return NULL;