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