diff -r a652b7763f66 -r 09397d0dd3b7 mercurial/dagutil.py
--- a/mercurial/dagutil.py	Sat Oct 14 12:03:42 2017 -0400
+++ b/mercurial/dagutil.py	Sun Oct 15 00:37:24 2017 -0400
@@ -148,7 +148,7 @@
                     if (r is not None
                         and r != nullrev
                         and r not in rl.filteredrevs)]
-        return map(self._internalize, ids)
+        return [self._internalize(i) for i in ids]
 
 
 class revlogdag(revlogbaseddag):