1 error[E0782]: trait objects must include the `dyn` keyword
2 --> $DIR/dyn-trait-sugg-2021.rs:10:5
7 help: add `dyn` keyword before this trait
9 LL | <dyn Foo>::hi(123);
12 error: aborting due to previous error
14 For more information about this error, try `rustc --explain E0782`.