diff -r b65bd4b61d78 -r 79750d781928 mercurial/copies.py
--- a/mercurial/copies.py	Mon Nov 25 12:44:04 2019 -0800
+++ b/mercurial/copies.py	Wed Nov 13 20:33:22 2019 +0100
@@ -231,7 +231,7 @@
             else:
                 p1copies = {}
                 p2copies = {}
-                removed = ()
+                removed = []
             return p1, p2, p1copies, p2copies, removed
 
     else: