--- a/mercurial/cmdutil.py	Fri Dec 01 14:13:55 2017 -0800
+++ b/mercurial/cmdutil.py	Fri Dec 01 16:53:55 2017 +0530
@@ -3722,7 +3722,7 @@
                                 else:
                                     util.rename(target, bakname)
                     if ui.verbose or not exact:
-                        if not isinstance(msg, basestring):
+                        if not isinstance(msg, bytes):
                             msg = msg(abs)
                         ui.status(msg % rel)
                 elif exact: