diff -r a4cac7b0ea4f -r f10cb49951e1 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Tue Apr 17 13:46:18 2018 +0200
+++ b/mercurial/subrepo.py	Wed Apr 18 19:25:35 2018 +0530
@@ -352,7 +352,7 @@
         matched by the match function
         '''
 
-    def forget(self, match, prefix, dryrun, confirm):
+    def forget(self, match, prefix, dryrun, interactive):
         return ([], [])
 
     def removefiles(self, matcher, prefix, after, force, subrepos,
@@ -816,10 +816,10 @@
         return ctx.walk(match)
 
     @annotatesubrepoerror
-    def forget(self, match, prefix, dryrun, confirm):
+    def forget(self, match, prefix, dryrun, interactive):
         return cmdutil.forget(self.ui, self._repo, match,
                               self.wvfs.reljoin(prefix, self._path),
-                              True, dryrun=dryrun, confirm=confirm)
+                              True, dryrun=dryrun, interactive=interactive)
 
     @annotatesubrepoerror
     def removefiles(self, matcher, prefix, after, force, subrepos,