diff --git a/exercises/move_semantics/move_semantics4.rs b/exercises/move_semantics/move_semantics4.rs
index 903a330..d47e009 100644
--- a/exercises/move_semantics/move_semantics4.rs
+++ b/exercises/move_semantics/move_semantics4.rs
@@ -16,7 +16,8 @@ fn main() {
 
 }
 
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+// `fill_vec()` no longer take `vec: Vec<i32>` as argument
+fn fill_vec() -> Vec<i32> {
     let mut vec = vec;
 
     vec.push(22);
diff --git a/exercises/test2.rs b/exercises/test2.rs
index 249abbc..75a4739 100644
--- a/exercises/test2.rs
+++ b/exercises/test2.rs
@@ -17,6 +17,11 @@ mod tests {
 
     #[test]
     fn returns_twice_of_positive_numbers() {
-        assert_eq!(4, 4);
+        assert_eq!(times_two(4), ???);
+    }
+
+    #[test]
+    fn returns_twice_of_negative_numbers() {
+        // TODO write an assert for `times_two(-4)`
     }
 }