--- a/mercurial/context.py	Tue Mar 17 14:52:58 2015 -0700
+++ b/mercurial/context.py	Wed Mar 18 09:26:26 2015 -0700
@@ -594,7 +594,7 @@
 
         # avoid the entire walk if we're only looking for specific files
         if fset and not match.anypats():
-            if util.all([fn in self for fn in fset]):
+            if util.all(fn in self for fn in fset):
                 for fn in sorted(fset):
                     if match(fn):
                         yield fn