| //@ 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() {} |