--- a/tests/test-requires.t	Sat May 06 04:51:25 2017 +0530
+++ b/tests/test-requires.t	Fri Feb 10 16:56:29 2017 -0800
@@ -37,7 +37,7 @@
   >     for name, module in extensions.extensions(ui):
   >         if __name__ == module.__name__:
   >             # support specific feature locally
-  >             supported |= set(['featuresetup-test'])
+  >             supported |= {'featuresetup-test'}
   >             return
   > def uisetup(ui):
   >     localrepo.localrepository.featuresetupfuncs.add(featuresetup)