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error[E0106]: missing lifetime specifier
--> $DIR/impl-trait-missing-lifetime.rs:9:54
|
LL | fn g(mut x: impl Iterator<Item = &'_ ()>) -> 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, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`, or if you will only have owned values
|
LL | fn g(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
| ~~~~~~~
help: consider introducing a named lifetime parameter
|
LL | fn g<'a>(mut x: impl Iterator<Item = &'a ()>) -> Option<&'a ()> { x.next() }
| ++++ ~~~ ~~~
help: alternatively, you might want to return an owned value
|
LL - fn g(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
LL + fn g(mut x: impl Iterator<Item = &'_ ()>) -> Option<()> { x.next() }
|
error[E0106]: missing lifetime specifier
--> $DIR/impl-trait-missing-lifetime.rs:16:60
|
LL | async fn i(mut x: impl Iterator<Item = &'_ ()>) -> 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, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`, or if you will only have owned values
|
LL | async fn i(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'static ()> { x.next() }
| ~~~~~~~
help: consider introducing a named lifetime parameter
|
LL | async fn i<'a>(mut x: impl Iterator<Item = &'a ()>) -> Option<&'a ()> { x.next() }
| ++++ ~~~ ~~~
help: alternatively, you might want to return an owned value
|
LL - async fn i(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
LL + async fn i(mut x: impl Iterator<Item = &'_ ()>) -> Option<()> { x.next() }
|
error: lifetime may not live long enough
--> $DIR/impl-trait-missing-lifetime.rs:16:69
|
LL | async fn i(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
| ----------------------------------------------------------------- ^^^^^^^^ returning this value requires that `'1` must outlive `'static`
| |
| return type `impl Future<Output = Option<&'static ()>>` contains a lifetime `'1`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0106`.
|
