--- a/mercurial/localrepo.py Wed Apr 04 14:31:09 2018 -0700
+++ b/mercurial/localrepo.py Wed Apr 04 14:57:58 2018 -0700
@@ -1023,7 +1023,7 @@
if key in self.branchmap():
return key
- return self[key].branch()
+ return scmutil.revsymbol(self, key).branch()
def known(self, nodes):
cl = self.changelog