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error[E0106]: missing lifetime specifier
--> $DIR/elision.rs:4:70
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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(x: &mut dyn Iterator<Item: Iterator<Item = &'_ ()>>) -> Option<&'_ ()> { x.next() }
LL + fn f<'a>(x: &'a mut dyn Iterator<Item: Iterator<Item = &'a ()>>) -> Option<&'a ()> { x.next() }
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error: associated type bounds are not allowed in `dyn` types
--> $DIR/elision.rs:4:27
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LL | fn f(x: &mut dyn Iterator<Item: Iterator<Item = &'_ ()>>) -> Option<&'_ ()> { x.next() }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: use `impl Trait` to introduce a type instead
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LL - fn f(x: &mut dyn Iterator<Item: Iterator<Item = &'_ ()>>) -> Option<&'_ ()> { x.next() }
LL + fn f(x: &mut dyn Iterator<Item = impl Iterator<Item = &'_ ()>>) -> Option<&'_ ()> { x.next() }
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error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0106`.
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