| // We need to opt into the `!` feature in order to trigger the |
| // requirement that this is testing. |
| #![feature(never_type)] |
| |
| #![allow(unused)] |
| |
| trait Deserialize: Sized { |
| fn deserialize() -> Result<Self, String>; |
| } |
| |
| impl Deserialize for () { |
| fn deserialize() -> Result<(), String> { |
| Ok(()) |
| } |
| } |
| |
| trait ImplementedForUnitButNotNever {} |
| |
| impl ImplementedForUnitButNotNever for () {} |
| |
| fn foo<T: ImplementedForUnitButNotNever>(_t: T) {} |
| //~^ NOTE required by `foo` |
| |
| fn smeg() { |
| let _x = return; |
| foo(_x); |
| //~^ ERROR the trait bound |
| //~| NOTE the trait `ImplementedForUnitButNotNever` is not implemented |
| //~| NOTE the trait is implemented for `()` |
| } |
| |
| fn main() { |
| smeg(); |
| } |