diff --git a/unittests/lambda.chai b/unittests/lambda.chai
index 9b717ec5..71f7bb2b 100644
--- a/unittests/lambda.chai
+++ b/unittests/lambda.chai
@@ -1,2 +1,6 @@
 auto bob = fun(x) { x + 1 }
 assert_equal(4, bob(3));
+
+var y=3
+auto bob2 = fun[y](x) { x + y }
+assert_equal(7, bob2(4))