rust/tests/ui/rfcs/rfc-2027-object-safe-for-dispatch/downcast-unsafe-trait-objects.rs

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// Check that we if we get ahold of an object unsafe trait
// object with auto traits and lifetimes, we can downcast it
//
// check-pass
#![feature(object_safe_for_dispatch)]
trait Trait: Sized {}
fn downcast_auto(t: &(dyn Trait + Send)) -> &dyn Trait {
t
}
fn downcast_lifetime<'a, 'b, 't>(t: &'a (dyn Trait + 't))
-> &'b (dyn Trait + 't)
where
'a: 'b,
't: 'a + 'b,
{
t
}
fn main() {}