diff --git a/unittests/vector_push_back.chai b/unittests/vector_push_back.chai
index 176e1ce..148e7ff 100644
--- a/unittests/vector_push_back.chai
+++ b/unittests/vector_push_back.chai
@@ -12,9 +12,6 @@ uint16v.push_back(1u);
 assert_equal(1, uint16v.front());
 
 
-// push_back newly constructed return value that's non-copyable
-
-var v = []
-v.push_back(async(fun(){}))
+