error: trait objects without an explicit `dyn` are deprecated
  --> $DIR/dyn-2018-edition-lint.rs:4:17
   |
LL | fn function(x: &SomeTrait, y: Box<SomeTrait>) {
   |                 ^^^^^^^^^ help: use `dyn`: `dyn SomeTrait`
   |
note: the lint level is defined here
  --> $DIR/dyn-2018-edition-lint.rs:2:8
   |
LL | #[deny(bare_trait_objects)]
   |        ^^^^^^^^^^^^^^^^^^
   = warning: this is accepted in the current edition (Rust 2018) 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/dyn-2018-edition-lint.rs:4:35
   |
LL | fn function(x: &SomeTrait, y: Box<SomeTrait>) {
   |                                   ^^^^^^^^^ help: use `dyn`: `dyn SomeTrait`
   |
   = warning: this is accepted in the current edition (Rust 2018) 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/dyn-2018-edition-lint.rs:9:14
   |
LL |     let _x: &SomeTrait = todo!();
   |              ^^^^^^^^^ help: use `dyn`: `dyn SomeTrait`
   |
   = warning: this is accepted in the current edition (Rust 2018) 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