--- a/hgext3rd/evolve/cmdrewrite.py	Wed Jul 17 11:03:09 2019 -0700
+++ b/hgext3rd/evolve/cmdrewrite.py	Fri Jul 12 17:02:35 2019 -0700
@@ -1017,7 +1017,8 @@
 
     options = [o for o in ('pair', 'fold', 'split') if opts.get(o)]
     if 1 < len(options):
-        raise error.Abort(_("can only specify one of %s") % ', '.join(options))
+        _opts = pycompat.sysbytes(', '.join(options))
+        raise error.Abort(_("can only specify one of %s") % _opts)
 
     if bookmarks:
         reachablefrombookmark = rewriteutil.reachablefrombookmark