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>) {
   |                 ^^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
note: the lint level is defined here
  --> $DIR/dyn-2018-edition-lint.rs:2:8
   |
LL | #[deny(bare_trait_objects)]
   |        ^^^^^^^^^^^^^^^^^^
help: if this is a dyn-compatible trait, use `dyn`
   |
LL | fn function(x: &dyn SomeTrait, y: Box<SomeTrait>) {
   |                 +++

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>) {
   |                                   ^^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
help: if this is a dyn-compatible trait, use `dyn`
   |
LL | fn function(x: &SomeTrait, y: Box<dyn SomeTrait>) {
   |                                   +++

error: trait objects without an explicit `dyn` are deprecated
  --> $DIR/dyn-2018-edition-lint.rs:9:14
   |
LL |     let _x: &SomeTrait = todo!();
   |              ^^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     let _x: &dyn SomeTrait = todo!();
   |              +++

error: aborting due to 3 previous errors