rust/tests/ui/traits/trait-upcasting/upcast-through-struct-tail.rs

// check-pass
// revisions: current next
//[next] compile-flags: -Znext-solver

struct Wrapper<T: ?Sized>(T);

trait A: B {}
trait B {}

fn test<'a>(x: Box<Wrapper<dyn A + 'a>>) -> Box<Wrapper<dyn B + 'a>> {
    x
}

fn main() {}
Stabilize RFC3324 dyn upcasting coercion Aka trait_upcasting feature. And also adjust the `deref_into_dyn_supertrait` lint. 2023-11-21 13:58:01 +01:00			`// check-pass`
Detect trait upcasting through struct tail unsizing 2023-07-29 01:04:04 +00:00			`// revisions: current next`
update use of feature flags 2023-12-14 13:11:28 +01:00			`//[next] compile-flags: -Znext-solver`
Detect trait upcasting through struct tail unsizing 2023-07-29 01:04:04 +00:00
			`struct Wrapper<T: ?Sized>(T);`

			`trait A: B {}`
			`trait B {}`

			`fn test<'a>(x: Box<Wrapper<dyn A + 'a>>) -> Box<Wrapper<dyn B + 'a>> {`
			`x`
			`}`

			`fn main() {}`