# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-09-23 19:21:38
# Node ID 5c00c5298f9807ae4f329dc25d517c4091bc43f3
# Parent  c425b22a7ca56e15b63415730862776b72f07153

obsolete: ensure that `getrevs` always return a set

When a set of revisions was empty, we were using an empty tuple. We now return an
empty frozenset to ensure the object could be used in an operation that requires a
set.

diff --git a/mercurial/obsolete.py b/mercurial/obsolete.py
--- a/mercurial/obsolete.py
+++ b/mercurial/obsolete.py
@@ -852,7 +852,7 @@ def getrevs(repo, name):
     Such access may compute the set and cache it for future use"""
     repo = repo.unfiltered()
     if not repo.obsstore:
-        return ()
+        return frozenset()
     if name not in repo.obsstore.caches:
         repo.obsstore.caches[name] = cachefuncs[name](repo)
     return repo.obsstore.caches[name]