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error[E0106]: missing lifetime specifier
--> $DIR/impl-trait-missing-lifetime-gated.rs:8:50
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LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
| ^^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime
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LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
| ~~~~~~~
error[E0106]: missing lifetime specifier
--> $DIR/impl-trait-missing-lifetime-gated.rs:18:56
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LL | async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
| ^^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime
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LL | async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
| ~~~~~~~
error[E0658]: anonymous lifetimes in `impl Trait` are unstable
--> $DIR/impl-trait-missing-lifetime-gated.rs:5:31
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LL | fn f(_: impl Iterator<Item = &'_ ()>) {}
| ^^
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= help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
error[E0658]: anonymous lifetimes in `impl Trait` are unstable
--> $DIR/impl-trait-missing-lifetime-gated.rs:8:31
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LL | fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
| ^^
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= help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0106, E0658.
For more information about an error, try `rustc --explain E0106`.
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