mercurial/requirements.py

--- a/mercurial/requirements.py	Wed Mar 03 14:00:45 2021 +0100
+++ b/mercurial/requirements.py	Wed Mar 03 12:30:23 2021 +0100
@@ -7,6 +7,8 @@
 
 from __future__ import absolute_import
 
+GENERALDELTA_REQUIREMENT = b'generaldelta'
+
 # When narrowing is finalized and no longer subject to format changes,
 # we should move this to just "narrow" or similar.
 NARROW_REQUIREMENT = b'narrowhg-experimental'