diff --git a/unittests/list_push_back.chai b/unittests/list_push_back.chai
index 19d17e1..5a058fc 100644
--- a/unittests/list_push_back.chai
+++ b/unittests/list_push_back.chai
@@ -6,3 +6,9 @@ x.push_back("A")
 
 assert_equal(3, x.front());
 assert_equal("A", x.back());
+
+
+// push_back newly constructed return value that's non-copyable
+x.push_back(async(fun(){}))
+
+
diff --git a/unittests/list_push_front.chai b/unittests/list_push_front.chai
index fe31821..b07c273 100644
--- a/unittests/list_push_front.chai
+++ b/unittests/list_push_front.chai
@@ -6,3 +6,8 @@ x.push_front("A")
 
 assert_equal("A", x.front());
 assert_equal(3, x.back());
+
+// push_back newly constructed return value that's non-copyable
+x.push_front(async(fun(){}))
+
+
diff --git a/unittests/vector_push_back.chai b/unittests/vector_push_back.chai
index eea34b7..176e1ce 100644
--- a/unittests/vector_push_back.chai
+++ b/unittests/vector_push_back.chai
@@ -11,3 +11,10 @@ auto uint16v = u16vector();
 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(){}))
+
+