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mercurial/dagop.py
changeset 42057 566daffc607d
parent 41533 0f64091cc851
child 42445 3e42fc243741 
--- a/mercurial/dagop.py	Wed Jul 19 13:17:49 2017 -0700
+++ b/mercurial/dagop.py	Wed Apr 03 11:21:27 2019 -0700
@@ -764,7 +764,7 @@
     the input set.
     """
     headrevs = set(revs)
-    parents = set([node.nullrev])
+    parents = {node.nullrev}
     up = parents.update
 
     for rev in revs:
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