diff -r 3b6f25190157 -r dc36535a5edc mercurial/branchmap.py
--- a/mercurial/branchmap.py	Mon Jan 06 13:54:40 2025 -0500
+++ b/mercurial/branchmap.py	Mon Jan 06 14:07:43 2025 -0500
@@ -145,7 +145,7 @@
                     closed.add(h)
 
         if rbheads:
-            rtiprev = max((int(clrev(node)) for node in rbheads))
+            rtiprev = max(int(clrev(node)) for node in rbheads)
             cache = new_branch_cache(
                 repo,
                 remotebranchmap,