diff -r 9a26fea2b518 -r 64d18e9e8508 mercurial/metadata.py
--- a/mercurial/metadata.py	Sat Sep 12 21:45:37 2020 +0900
+++ b/mercurial/metadata.py	Tue Sep 22 10:27:35 2020 +0200
@@ -318,7 +318,7 @@
         return None
 
 
-def encode_copies_sidedata(files):
+def encode_files_sidedata(files):
     sortedfiles = sorted(files.touched)
     sidedata = {}
     p1copies = files.copied_from_p1