diff -r 7a8ea1397816 -r d718eddf01d9 mercurial/wireprotov1server.py
--- a/mercurial/wireprotov1server.py	Thu Dec 08 15:33:19 2022 +0100
+++ b/mercurial/wireprotov1server.py	Thu Aug 31 23:56:15 2023 +0200
@@ -721,7 +721,7 @@
                 r = exchange.unbundle(
                     repo, gen, their_heads, b'serve', proto.client()
                 )
-                if util.safehasattr(r, 'addpart'):
+                if hasattr(r, 'addpart'):
                     # The return looks streamable, we are in the bundle2 case
                     # and should return a stream.
                     return wireprototypes.streamreslegacy(gen=r.getchunks())