--- a/tests/test-duplicateoptions.py	Sat May 06 04:51:25 2017 +0530
+++ b/tests/test-duplicateoptions.py	Fri Feb 10 16:56:29 2017 -0800
@@ -6,7 +6,7 @@
     ui as uimod,
 )
 
-ignore = set(['highlight', 'win32text', 'factotum'])
+ignore = {'highlight', 'win32text', 'factotum'}
 
 if os.name != 'nt':
     ignore.add('win32mbcs')