error: trait objects without an explicit `dyn` are deprecated
  --> $DIR/ice-3969.rs:25:17
   |
LL |     for<'a> Dst<A + 'a>: Sized,
   |                 ^^^^^^ help: use `dyn`: `dyn A + 'a`
   |
   = note: `-D bare-trait-objects` implied by `-D warnings`
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>

error: trait objects without an explicit `dyn` are deprecated
  --> $DIR/ice-3969.rs:27:16
   |
LL |     let x: Dst<A> = *(Box::new(Dst { x: 1 }) as Box<Dst<A>>);
   |                ^ help: use `dyn`: `dyn A`
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>

error: trait objects without an explicit `dyn` are deprecated
  --> $DIR/ice-3969.rs:27:57
   |
LL |     let x: Dst<A> = *(Box::new(Dst { x: 1 }) as Box<Dst<A>>);
   |                                                         ^ help: use `dyn`: `dyn A`
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>

error: aborting due to 3 previous errors