diff -r f075a9463ee7 -r a6e2a668c746 mercurial/interfaces/repository.py
--- a/mercurial/interfaces/repository.py	Fri Dec 02 18:04:51 2022 +0100
+++ b/mercurial/interfaces/repository.py	Sat Dec 03 00:00:41 2022 +0100
@@ -387,6 +387,12 @@
 
     limitedarguments = False
 
+    def __init__(
+        self,
+        ui,
+    ):
+        self.ui = ui
+
     def capable(self, name):
         caps = self.capabilities()
         if name in caps: