error: you seem to be trying to use `Box<Vec<T>>`. Consider using just `Vec<T>` --> $DIR/box_vec.rs:17:18 | 17 | pub fn test(foo: Box<Vec<bool>>) { | ^^^^^^^^^^^^^^ | = note: `-D box-vec` implied by `-D warnings` = help: `Vec<T>` is already on the heap, `Box<Vec<T>>` makes an extra allocation. error: aborting due to previous error