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error: trait objects without an explicit `dyn` are deprecated
--> tests/ui/bare-trait-object.rs:11:16
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11 | impl Trait for Send + Sync {
| ^^^^^^^^^^^ help: use `dyn`: `dyn Send + Sync`
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note: the lint level is defined here
--> tests/ui/bare-trait-object.rs:1:9
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1 | #![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 <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
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