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#![feature(type_alias_impl_trait)] | ||
#![feature(impl_trait_in_bindings)] | ||
#![allow(incomplete_features)] | ||
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type FooArg<'a> = &'a dyn ToString; | ||
type FooRet = impl std::fmt::Debug; | ||
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type FooItem = Box<dyn Fn(FooArg) -> FooRet>; | ||
type Foo = impl Iterator<Item = FooItem>; //~ ERROR: type mismatch | ||
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#[repr(C)] | ||
struct Bar(u8); | ||
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impl Iterator for Bar { | ||
type Item = FooItem; | ||
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fn next(&mut self) -> Option<Self::Item> { | ||
Some(Box::new(quux)) | ||
} | ||
} | ||
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fn quux(st: FooArg) -> FooRet { | ||
Some(st.to_string()) | ||
} | ||
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fn ham() -> Foo { | ||
Bar(1) | ||
} | ||
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fn oof() -> impl std::fmt::Debug { | ||
let mut bar = ham(); | ||
let func = bar.next().unwrap(); | ||
return func(&"oof"); | ||
} | ||
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fn main() { | ||
let _ = oof(); | ||
} |
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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` | ||
| | ||
= 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)>` | ||
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error: aborting due to previous error | ||
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For more information about this error, try `rustc --explain E0271`. |