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error[E0308]: mismatched types
--> $DIR/issue-70877.rs:16:9
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LL | type FooRet = impl std::fmt::Debug;
| -------------------- the expected opaque type
...
LL | fn next(&mut self) -> Option<Self::Item> {
| ------------------ expected `Option<Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> FooRet + 'static)>>` because of return type
LL | Some(Box::new(quux))
| ^^^^^^^^^^^^^^^^^^^^ expected trait object `dyn Fn`, found fn item
|
= note: expected enum `Option<Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> FooRet + 'static)>>`
found enum `Option<Box<for<'r> fn(&'r (dyn ToString + 'r)) -> FooRet {quux}>>`
error: opaque type's hidden type cannot be another opaque type from the same scope
--> $DIR/issue-70877.rs:31:12
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LL | return func(&"oof");
| ^^^^^^^^^^^^ one of the two opaque types used here has to be outside its defining scope
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note: opaque type whose hidden type is being assigned
--> $DIR/issue-70877.rs:28:13
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LL | fn oof() -> impl std::fmt::Debug {
| ^^^^^^^^^^^^^^^^^^^^
note: opaque type being used as hidden type
--> $DIR/issue-70877.rs:4:15
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LL | type FooRet = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0308`.
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