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error[E0106]: missing lifetime specifier
--> $DIR/elision.rs:5:70
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LL | fn f(x: &mut dyn Iterator<Item: Iterator<Item = &'_ ()>>) -> Option<&'_ ()> { x.next() }
| ------------------------------------------------ ^^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but the signature does not say which one of `x`'s 2 lifetimes it is borrowed from
help: consider introducing a named lifetime parameter
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LL | fn f<'a>(x: &'a mut dyn Iterator<Item: Iterator<Item = &'a ()>>) -> Option<&'a ()> { x.next() }
| ++++ ++ ~~ ~~
error[E0308]: mismatched types
--> $DIR/elision.rs:5:79
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LL | fn f(x: &mut dyn Iterator<Item: Iterator<Item = &'_ ()>>) -> Option<&'_ ()> { x.next() }
| ----------------------------- -------------- ^^^^^^^^ expected `&()`, found type parameter `impl Iterator<Item = &'_ ()>`
| | |
| | expected `Option<&'static ()>` because of return type
| this type parameter
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= note: expected enum `Option<&'static ()>`
found enum `Option<impl Iterator<Item = &'_ ()>>`
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0106, E0308.
For more information about an error, try `rustc --explain E0106`.
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