diff -r c10c87c8fe79 -r 508dfd1c18df mercurial/commands.py
--- a/mercurial/commands.py	Wed Sep 09 17:04:44 2020 +0900
+++ b/mercurial/commands.py	Sun Oct 04 13:17:57 2020 +0900
@@ -3532,7 +3532,7 @@
 
     ui.pager(b'grep')
     fm = ui.formatter(b'grep', opts)
-    for ctx in cmdutil.walkchangerevs(
+    for ctx in scmutil.walkchangerevs(
         repo, revs, makefilematcher, searcher._prep
     ):
         rev = ctx.rev()