--- a/tests/test-export.t	Fri Mar 02 07:17:06 2018 +0530
+++ b/tests/test-export.t	Sat Mar 03 14:23:40 2018 -0800
@@ -218,6 +218,8 @@
   [255]
   $ hg export -o '%m{' tip
   hg: parse error at 3: unterminated template expansion
+  (%m{
+     ^ here)
   [255]
   $ hg export -o '%\' tip
   abort: invalid format spec '%\' in output filename