1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 0d84f67..dcc7956 100644
--- a/Makefile
+++ b/Makefile
@@ -3,3 +3,4 @@
 test:
 	guile -L . tests/infix-to-prefix-tests.scm
 	cat infix-to-prefix.log
+	! grep -F FAIL infix-to-prefix.log