diff -r 0d612db7047c -r c59eb1560c44 mercurial/revlog.py
--- a/mercurial/revlog.py	Sun Oct 06 16:39:13 2019 -0400
+++ b/mercurial/revlog.py	Sun Oct 06 16:55:18 2019 -0400
@@ -35,6 +35,7 @@
     wdirrev,
 )
 from .i18n import _
+from .pycompat import getattr
 from .revlogutils.constants import (
     FLAG_GENERALDELTA,
     FLAG_INLINE_DATA,