error: `Vec<T>` is already on the heap, the boxing is unnecessary --> $DIR/test.rs:9:12 | LL | struct Foo(Vec<Box<u8>>); | ^^^^^^^^^^^^ help: try: `Vec<u8>` | = note: `-D clippy::vec-box` implied by `-D warnings` error: `Vec<T>` is already on the heap, the boxing is unnecessary --> $DIR/test.rs:10:12 | LL | struct Bar(Vec<Box<u32>>); | ^^^^^^^^^^^^^ help: try: `Vec<u32>` error: `Vec<T>` is already on the heap, the boxing is unnecessary --> $DIR/test.rs:13:18 | LL | struct FooBarBaz(Vec<Box<C>>); | ^^^^^^^^^^^ help: try: `Vec<C>` error: aborting due to 3 previous errors