diff -r 2959c3e986e0 -r bd872f64a8ba mercurial/namespaces.py
--- a/mercurial/namespaces.py	Sat May 06 04:51:25 2017 +0530
+++ b/mercurial/namespaces.py	Fri Feb 10 16:56:29 2017 -0800
@@ -46,7 +46,7 @@
                       logfmt=_("tag:         %s\n"),
                       listnames=tagnames,
                       namemap=tagnamemap, nodemap=tagnodemap,
-                      deprecated=set(['tip']))
+                      deprecated={'tip'})
         self.addnamespace(n)
 
         bnames = lambda repo: repo.branchmap().keys()