--- a/mercurial/vfs.py	Wed Jul 10 18:34:47 2024 -0400
+++ b/mercurial/vfs.py	Wed Jul 10 18:44:55 2024 -0400
@@ -291,7 +291,7 @@
 
     def rmtree(
         self, path: Optional[bytes] = None, ignore_errors=False, forcibly=False
-    ):
+    ) -> None:
         """Remove a directory tree recursively
 
         If ``forcibly``, this tries to remove READ-ONLY files, too.