--- a/.hgignore	Sun Nov 19 04:47:10 2017 +0100
+++ b/.hgignore	Thu Nov 23 00:29:52 2017 +0100
@@ -6,7 +6,7 @@
 \.swp$
 \.orig$
 \.rej$
-\.err$
+^tests/.*\.err$
 ^tests/easy_run.sh$
 ^build/
 ^dist/