rust/tests/ui/impl-trait/unsized_coercion4.rs

21 lines
401 B
Rust

//! This test checks that opaque types get unsized instead of
//! constraining their hidden type to a trait object.
//@ revisions: next old
//@[next] compile-flags: -Znext-solver
//@check-pass
trait Trait {}
impl Trait for u32 {}
fn hello() -> Box<impl Trait + ?Sized> {
if true {
let x = hello() as Box<u32>;
let y: Box<dyn Send> = x;
}
Box::new(1u32)
}
fn main() {}