# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 2017-03-12 01:53:20
# Node ID 1470b0f771c8d78896c5c2965ed87f6f3562b527
# Parent  66f1c244b43a962e3224420f30eaa0b2e0980244

phases: explicitly evaluate list returned by map

On Python 3 map() returns a generator, which bool()s to true even if
it had an empty input set. Work around this by using list() on the
map() result.

diff --git a/mercurial/phases.py b/mercurial/phases.py
--- a/mercurial/phases.py
+++ b/mercurial/phases.py
@@ -213,7 +213,7 @@ class phasecache(object):
         self._phaserevs = revs
         self._populatephaseroots(repo)
         for phase in trackedphases:
-            roots = map(repo.changelog.rev, self.phaseroots[phase])
+            roots = list(map(repo.changelog.rev, self.phaseroots[phase]))
             if roots:
                 for rev in roots:
                     revs[rev] = phase