warning: adding an auto trait `Send` to a trait object in a pointer cast may cause UB later on
  --> $DIR/ptr-to-trait-obj-add-auto.rs:6:5
   |
LL |     x as _
   |     ^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
   = note: `#[warn(ptr_cast_add_auto_to_object)]` on by default

warning: adding auto traits `Send`, `Sync`, and `Unpin` to a trait object in a pointer cast may cause UB later on
  --> $DIR/ptr-to-trait-obj-add-auto.rs:13:5
   |
LL |     x as _
   |     ^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>

warning: 2 warnings emitted

Future incompatibility report: Future breakage diagnostic:
warning: adding an auto trait `Send` to a trait object in a pointer cast may cause UB later on
  --> $DIR/ptr-to-trait-obj-add-auto.rs:6:5
   |
LL |     x as _
   |     ^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
   = note: `#[warn(ptr_cast_add_auto_to_object)]` on by default

Future breakage diagnostic:
warning: adding auto traits `Send`, `Sync`, and `Unpin` to a trait object in a pointer cast may cause UB later on
  --> $DIR/ptr-to-trait-obj-add-auto.rs:13:5
   |
LL |     x as _
   |     ^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #127323 <https://github.com/rust-lang/rust/issues/127323>
   = note: `#[warn(ptr_cast_add_auto_to_object)]` on by default