--- a/mercurial/cmdutil.py	Thu May 03 15:08:16 2018 +0900
+++ b/mercurial/cmdutil.py	Thu Apr 19 20:33:43 2018 +0900
@@ -63,11 +63,6 @@
      _('do not perform actions, just print output')),
 ]
 
-confirmopts = [
-    ('', 'confirm', None,
-     _('ask before applying actions')),
-]
-
 remoteopts = [
     ('e', 'ssh', '',
      _('specify ssh command to use'), _('CMD')),