--- a/bench.py	Fri Dec 09 12:52:43 2016 +0800
+++ b/bench.py	Fri Dec 09 13:57:24 2016 +0800
@@ -13,7 +13,14 @@
 from settings import DBPATH, HG, LOCKFILE, TESTHGREPO, TESTREPO, rel
 
 
-REVSETWIP = '(parents(not public()) or not public() or . or (head() and branch(default))) and (not obsolete() or unstable()^) and not closed()'
+REVSETWIP = (
+    '(parents(not public())'
+    ' or not public()'
+    ' or .'
+    ' or (head() and branch(default)))'
+    ' and (not obsolete() or unstable()^)'
+    ' and not closed()'
+)
 MARKS = OrderedDict((
     ('blame', 'hg blame README'),
     ('grepall', 'hg grep "version" --all README'),