--- a/mercurial/dirstate.py	Thu Oct 14 22:35:46 2021 -0700
+++ b/mercurial/dirstate.py	Fri Oct 15 01:27:39 2021 +0200
@@ -39,6 +39,8 @@
 parsers = policy.importmod('parsers')
 rustmod = policy.importrust('dirstate')
 
+HAS_FAST_DIRSTATE_V2 = rustmod is not None
+
 propertycache = util.propertycache
 filecache = scmutil.filecache
 _rangemask = dirstatemap.rangemask