# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 2018-02-28 14:24:49
# Node ID d139eb3083584ab3742c4c9c1ee4ef997d501f27
# Parent  ab5f18a9dcacf135bcde59076d221860dcb5e651

py3: convert error messages to bytes using util.forcebytestr()

Differential Revision: https://phab.mercurial-scm.org/D2497

diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
--- a/mercurial/branchmap.py
+++ b/mercurial/branchmap.py
@@ -520,7 +520,7 @@ class revbranchcache(object):
                 self._rbcrevslen = revs
         except (IOError, OSError, error.Abort, error.LockError) as inst:
             repo.ui.debug("couldn't write revision branch cache%s: %s\n"
-                          % (step, inst))
+                          % (step, util.forcebytestr(inst)))
         finally:
             if wlock is not None:
                 wlock.release()