| //! 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 | |
| //@[next] check-pass | |
| trait Trait {} | |
| impl Trait for u32 {} | |
| fn hello() -> Box<impl Trait + ?Sized> { | |
| if true { | |
| let x = hello(); | |
| let y: Box<dyn Trait> = x; | |
| //[old]~^ ERROR: the size for values of type `impl Trait + ?Sized` cannot be know | |
| } | |
| Box::new(1u32) | |
| } | |
| fn main() {} |