rust/tests/ui/traits/trait-upcasting/migrate-lint-different-subs...

22 lines
426 B
Rust

//@ check-pass
#![warn(deref_into_dyn_supertrait)]
use std::ops::Deref;
trait Bar<T> {}
trait Foo: Bar<i32> {
fn as_dyn_bar_u32<'a>(&self) -> &(dyn Bar<u32> + 'a);
}
impl<'a> Deref for dyn Foo + 'a {
//~^ warn: this `Deref` implementation is covered by an implicit supertrait coercion
type Target = dyn Bar<u32> + 'a;
fn deref(&self) -> &Self::Target {
self.as_dyn_bar_u32()
}
}
fn main() {}