| //@ check-pass | |
| //@ compile-flags: -Znext-solver | |
| #![feature(trait_upcasting)] | |
| 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() {} |