# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 2018-03-04 17:33:15
# Node ID e79adc12cde37689db72cf38e84fe28ce647ff14
# Parent  a2fa51415ddc98e8f799c182ac1936be19bd7db9

templater: show repr of string we're rejecting

I feel like this should make it a little easier to hunt down problems.

Differential Revision: https://phab.mercurial-scm.org/D2659

diff --git a/mercurial/templater.py b/mercurial/templater.py
--- a/mercurial/templater.py
+++ b/mercurial/templater.py
@@ -1326,7 +1326,7 @@ def _flatten(thing):
         # We can only hit this on Python 3, and it's here to guard
         # against infinite recursion.
         raise error.ProgrammingError('Mercurial IO including templates is done'
-                                     ' with bytes, not strings')
+                                     ' with bytes, not strings, got %r' % thing)
     elif thing is None:
         pass
     elif not util.safehasattr(thing, '__iter__'):