rust/tests/ui/traits/new-solver/trait-upcast-lhs-needs-normalization.rs
Urgau 4c2d6de70e Stabilize RFC3324 dyn upcasting coercion
Aka trait_upcasting feature.

And also adjust the `deref_into_dyn_supertrait` lint.
2023-11-22 13:56:36 +01:00

19 lines
293 B
Rust

// check-pass
// compile-flags: -Ztrait-solver=next
pub trait A {}
pub trait B: A {}
pub trait Mirror {
type Assoc: ?Sized;
}
impl<T: ?Sized> Mirror for T {
type Assoc = T;
}
pub fn foo<'a>(x: &'a <dyn B + 'static as Mirror>::Assoc) -> &'a (dyn A + 'static) {
x
}
fn main() {}