mercurial/help.py

--- a/mercurial/help.py	Sat May 06 04:51:25 2017 +0530
+++ b/mercurial/help.py	Fri Feb 10 16:56:29 2017 -0800
@@ -34,7 +34,7 @@
     webcommands,
 )
 
-_exclkeywords = set([
+_exclkeywords = {
     "(ADVANCED)",
     "(DEPRECATED)",
     "(EXPERIMENTAL)",
@@ -44,7 +44,7 @@
     _("(DEPRECATED)"),
     # i18n: "(EXPERIMENTAL)" is a keyword, must be translated consistently
     _("(EXPERIMENTAL)"),
-    ])
+}
 
 def listexts(header, exts, indent=1, showdeprecated=False):
     '''return a text listing of the given extensions'''