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warning: the feature `async_fn_in_trait` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/feature-gate-return_type_notation.rs:7:12
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LL | #![feature(async_fn_in_trait)]
| ^^^^^^^^^^^^^^^^^
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= note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: return type notation is experimental
--> $DIR/feature-gate-return_type_notation.rs:15:17
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LL | fn foo<T: Trait<m(): Send>>() {}
| ^^^^^^^^^
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= note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
= help: add `#![feature(return_type_notation)]` to the crate attributes to enable
= warning: unstable syntax can change at any point in the future, causing a hard error!
= note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
warning: 2 warnings emitted
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