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error[E0308]: mismatched types
--> $DIR/issue-99387.rs:23:5
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LL | pub type Successors<'a> = impl Iterator<Item = &'a ()>;
| ---------------------------- the expected opaque type
...
LL | pub fn ohno<'a>() -> <&'a () as Tr>::Item {
| -------------------- expected `Successors<'a>` because of return type
LL | None.into_iter()
| ^^^^^^^^^^^^^^^^ expected opaque type, found `IntoIter<_>`
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= note: expected opaque type `Successors<'a>`
found struct `std::option::IntoIter<_>`
note: this item must have a `#[define_opaque(Successors)]` attribute to be able to define hidden types
--> $DIR/issue-99387.rs:22:8
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LL | pub fn ohno<'a>() -> <&'a () as Tr>::Item {
| ^^^^
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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