diff --git a/src/main.rs b/src/main.rs
index 9417d7e..2642e5c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -116,6 +116,7 @@ pub fn main() {
     eq? (1, 2)
     eq? (:foo, :foo)
     inc (3)
+    dec (0)
 ]
 ";
     run(src);