mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
23 lines
564 B
Rust
23 lines
564 B
Rust
// Test that `dyn Bar<Item = XX>` uses `'static` as the default object
|
|
// lifetime bound for the type `XX`.
|
|
|
|
trait Foo<'a> {
|
|
type Item: ?Sized;
|
|
|
|
fn item(&self) -> Box<Self::Item> { panic!() }
|
|
}
|
|
|
|
trait Bar { }
|
|
|
|
fn is_static<T>(_: T) where T: 'static { }
|
|
|
|
// Here, we should default to `dyn Bar + 'static`, but the current
|
|
// code forces us into a conservative, hacky path.
|
|
fn bar(x: &str) -> &dyn Foo<Item = dyn Bar> { &() }
|
|
//~^ ERROR please supply an explicit bound
|
|
|
|
fn main() {
|
|
let s = format!("foo");
|
|
let r = bar(&s);
|
|
is_static(r.item());
|
|
}
|