--- a/mercurial/testing/revlog.py	Mon Oct 30 21:28:30 2023 +0100
+++ b/mercurial/testing/revlog.py	Sun Oct 29 23:54:05 2023 +0100
@@ -57,5 +57,4 @@
         # not inheriting RevlogBasedTestCase to avoid having a
         # `parseindex` method that would be shadowed by future subclasses
         # this duplication will soon be removed
-        cindex = cparsers.parse_index2(data, False)[0]
-        return MixedIndex(cindex, data, REVLOGV1)
+        return MixedIndex(data, REVLOGV1)