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error[E0271]: type mismatch resolving `<Bar as Iterator>::Item == Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
--> $DIR/issue-70877.rs:9:12
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LL | type FooRet = impl std::fmt::Debug;
| -------------------- the expected opaque type
...
LL | type Foo = impl Iterator<Item = FooItem>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected opaque type, found enum `Option`
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= note: expected struct `Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> impl Debug + 'static)>`
found struct `Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0271`.
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