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warning: trait objects without an explicit `dyn` are deprecated
--> $DIR/lint-group-allowed-warn-by-default-lint.rs:10:25
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LL | pub fn function(_x: Box<SomeTrait>) {}
| ^^^^^^^^^
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= warning: this is accepted in the current edition (Rust 2015) 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: `--force-warn bare-trait-objects` implied by `--force-warn rust-2018-idioms`
help: if this is a dyn-compatible trait, use `dyn`
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LL | pub fn function(_x: Box<dyn SomeTrait>) {}
| +++
warning: 1 warning emitted
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