diff -r f35cf52acabd -r 3f3fca243dca mercurial/interfaces/dirstate.py
--- a/mercurial/interfaces/dirstate.py	Thu Feb 23 15:32:27 2023 +0100
+++ b/mercurial/interfaces/dirstate.py	Wed Feb 22 02:08:11 2023 +0100
@@ -166,13 +166,6 @@
     def rebuild(parent, allfiles, changedfiles=None):
         pass
 
-    def identity():
-        """Return identity of dirstate itself to detect changing in storage
-
-        If identity of previous dirstate is equal to this, writing
-        changes based on the former dirstate out can keep consistency.
-        """
-
     def write(tr):
         pass