diff -r 2cc453284d5c -r f3bcae1e9e23 mercurial/copies.py
--- a/mercurial/copies.py	Mon Sep 30 00:01:58 2019 +0200
+++ b/mercurial/copies.py	Thu Sep 26 23:43:32 2019 +0200
@@ -182,8 +182,9 @@
 
 def usechangesetcentricalgo(repo):
     """Checks if we should use changeset-centric copy algorithms"""
-    return (repo.ui.config('experimental', 'copies.read-from') in
-            ('changeset-only', 'compatibility'))
+    readfrom = repo.ui.config('experimental', 'copies.read-from')
+    changesetsource = ('changeset-only', 'compatibility')
+    return readfrom in changesetsource
 
 def _committedforwardcopies(a, b, base, match):
     """Like _forwardcopies(), but b.rev() cannot be None (working copy)"""