LL | pub fn function(_x: Box<SomeTrait>) {}
| ^^^^^^^^^ help: use `dyn`: `dyn SomeTrait`
|
- = note: warning forced by `force-warns` commandline option
+ = note: `--force-warns bare-trait-objects` implied by `--force-warns rust-2018-idioms`
= 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>