error: `Vec<T>` is already on the heap, the boxing is unnecessary.
  --> $DIR/vec_box_sized.rs:13:21
   |
LL |         sized_type: Vec<Box<SizedStruct>>,
   |                     ^^^^^^^^^^^^^^^^^^^^^ help: try: `Vec<SizedStruct>`
   |
   = note: `-D clippy::vec-box` implied by `-D warnings`

error: `Vec<T>` is already on the heap, the boxing is unnecessary.
  --> $DIR/vec_box_sized.rs:16:14
   |
LL |     struct A(Vec<Box<SizedStruct>>);
   |              ^^^^^^^^^^^^^^^^^^^^^ help: try: `Vec<SizedStruct>`

error: `Vec<T>` is already on the heap, the boxing is unnecessary.
  --> $DIR/vec_box_sized.rs:17:18
   |
LL |     struct B(Vec<Vec<Box<(u32)>>>);
   |                  ^^^^^^^^^^^^^^^ help: try: `Vec<u32>`

error: aborting due to 3 previous errors