File: upcast-through-struct-tail.rs

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rustc 1.85.0%2Bdfsg3-1
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//@ revisions: current next
//@ ignore-compare-mode-next-solver (explicit revisions)
//@[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
    //~^ ERROR cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
}

fn main() {}