diff -r bbe71b5afd02 -r ca5ca3badd3c contrib/import-checker.py
--- a/contrib/import-checker.py	Wed Aug 07 22:02:49 2019 +0200
+++ b/contrib/import-checker.py	Thu Aug 08 01:03:01 2019 +0200
@@ -31,6 +31,7 @@
     'mercurial.node',
     # for revlog to re-export constant to extensions
     'mercurial.revlogutils.constants',
+    'mercurial.revlogutils.flagutil',
     # for cffi modules to re-export pure functions
     'mercurial.pure.base85',
     'mercurial.pure.bdiff',