error[E0106]: missing lifetime specifier --> $DIR/impl-trait-missing-lifetime-gated.rs:9:54 | LL | fn g(mut x: impl Iterator) -> Option<&()> { x.next() } | ^ expected named lifetime parameter | = 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 | LL | fn g(mut x: impl Iterator) -> Option<&'static ()> { x.next() } | +++++++ error[E0106]: missing lifetime specifier --> $DIR/impl-trait-missing-lifetime-gated.rs:19:60 | LL | async fn i(mut x: impl Iterator) -> Option<&()> { x.next() } | ^ expected named lifetime parameter | = 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 | LL | async fn i(mut x: impl Iterator) -> Option<&'static ()> { x.next() } | +++++++ error[E0106]: missing lifetime specifier --> $DIR/impl-trait-missing-lifetime-gated.rs:27:58 | LL | fn g(mut x: impl Iterator) -> Option<&'_ ()> { x.next() } | ^^ expected named lifetime parameter | = 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 | LL | fn g(mut x: impl Iterator) -> Option<&'static ()> { x.next() } | ~~~~~~~ error[E0106]: missing lifetime specifier --> $DIR/impl-trait-missing-lifetime-gated.rs:37:64 | LL | async fn i(mut x: impl Iterator) -> Option<&'_ ()> { x.next() } | ^^ expected named lifetime parameter | = 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 | LL | async fn i(mut x: impl Iterator) -> Option<&'static ()> { x.next() } | ~~~~~~~ error[E0106]: missing lifetime specifier --> $DIR/impl-trait-missing-lifetime-gated.rs:47:37 | LL | fn g(mut x: impl Foo) -> Option<&()> { x.next() } | ^ expected named lifetime parameter | = 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 | LL | fn g(mut x: impl Foo) -> Option<&'static ()> { x.next() } | +++++++ error[E0106]: missing lifetime specifier --> $DIR/impl-trait-missing-lifetime-gated.rs:58:41 | LL | fn g(mut x: impl Foo<()>) -> Option<&()> { x.next() } | ^ expected named lifetime parameter | = 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 | LL | fn g(mut x: impl Foo<()>) -> Option<&'static ()> { x.next() } | +++++++ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:6:35 | LL | fn f(_: impl Iterator) {} | ^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn f<'a>(_: impl Iterator) {} | ++++ ++ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:9:39 | LL | fn g(mut x: impl Iterator) -> Option<&()> { x.next() } | ^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn g<'a>(mut x: impl Iterator) -> Option<&()> { x.next() } | ++++ ++ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:24:35 | LL | fn f(_: impl Iterator) {} | ^^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn f<'a>(_: impl Iterator) {} | ++++ ~~ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:27:39 | LL | fn g(mut x: impl Iterator) -> Option<&'_ ()> { x.next() } | ^^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn g<'a>(mut x: impl Iterator) -> Option<&'_ ()> { x.next() } | ++++ ~~ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:44:18 | LL | fn f(_: impl Foo) {} | ^^^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn f<'a>(_: impl Foo<'a>) {} | ++++ ++++ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:47:22 | LL | fn g(mut x: impl Foo) -> Option<&()> { x.next() } | ^^^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn g<'a>(mut x: impl Foo<'a>) -> Option<&()> { x.next() } | ++++ ++++ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:55:22 | LL | fn f(_: impl Foo<()>) {} | ^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn f<'a>(_: impl Foo<'a, ()>) {} | ++++ +++ error[E0658]: anonymous lifetimes in `impl Trait` are unstable --> $DIR/impl-trait-missing-lifetime-gated.rs:58:26 | LL | fn g(mut x: impl Foo<()>) -> Option<&()> { x.next() } | ^ expected named lifetime parameter | = help: add `#![feature(anonymous_lifetime_in_impl_trait)]` to the crate attributes to enable help: consider introducing a named lifetime parameter | LL | fn g<'a>(mut x: impl Foo<'a, ()>) -> Option<&()> { x.next() } | ++++ +++ error: aborting due to 14 previous errors Some errors have detailed explanations: E0106, E0658. For more information about an error, try `rustc --explain E0106`.