--- a/mercurial/revlogutils/constants.py Mon Apr 05 12:21:12 2021 +0200
+++ b/mercurial/revlogutils/constants.py Mon Apr 05 12:21:23 2021 +0200
@@ -15,6 +15,8 @@
### main revlog header
+INDEX_HEADER = struct.Struct(b">I")
+
## revlog version
REVLOGV0 = 0
REVLOGV1 = 1