| //@ revisions: nofallback fallback |
| //@[nofallback] run-pass |
| //@[fallback] check-fail |
| |
| // We need to opt into the `never_type_fallback` feature |
| // to trigger the requirement that this is testing. |
| #![cfg_attr(fallback, feature(never_type, never_type_fallback))] |
| |
| #![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) {} |
| //[fallback]~^ NOTE required by this bound in `foo` |
| //[fallback]~| NOTE required by a bound in `foo` |
| fn smeg() { |
| let _x = return; |
| foo(_x); |
| //[fallback]~^ ERROR the trait bound |
| //[fallback]~| NOTE the trait `ImplementedForUnitButNotNever` is not implemented |
| //[fallback]~| HELP trait `ImplementedForUnitButNotNever` is implemented for `()` |
| //[fallback]~| NOTE this error might have been caused |
| //[fallback]~| NOTE required by a bound introduced by this call |
| //[fallback]~| HELP did you intend |
| } |
| |
| fn main() { |
| smeg(); |
| } |