| trait Foo {} |
| |
| trait Trait { |
| type Associated; |
| } |
| trait DerivedTrait: Trait {} |
| trait GenericTrait<A> { |
| type Associated; |
| } |
| |
| struct Impl; |
| impl Foo for Impl {} |
| impl Trait for Impl { |
| type Associated = (); |
| } |
| impl DerivedTrait for Impl {} |
| impl<A> GenericTrait<A> for Impl { |
| type Associated = (); |
| } |
| |
| fn returns_opaque() -> impl Trait + 'static { |
| Impl |
| } |
| fn returns_opaque_derived() -> impl DerivedTrait + 'static { |
| Impl |
| } |
| fn returns_opaque_foo() -> impl Trait + Foo { |
| Impl |
| } |
| fn returns_opaque_derived_foo() -> impl DerivedTrait + Foo { |
| Impl |
| } |
| fn returns_opaque_generic() -> impl GenericTrait<()> + 'static { |
| Impl |
| } |
| fn returns_opaque_generic_foo() -> impl GenericTrait<()> + Foo { |
| Impl |
| } |
| fn returns_opaque_generic_duplicate() -> impl GenericTrait<()> + GenericTrait<u8> { |
| Impl |
| } |
| |
| fn accepts_trait<T: Trait<Associated = ()>>(_: T) {} |
| fn accepts_generic_trait<T: GenericTrait<(), Associated = ()>>(_: T) {} |
| |
| fn check_generics<A, B, C, D, E, F, G>(a: A, b: B, c: C, d: D, e: E, f: F, g: G) |
| where |
| A: Trait + 'static, |
| B: DerivedTrait + 'static, |
| C: Trait + Foo, |
| D: DerivedTrait + Foo, |
| E: GenericTrait<()> + 'static, |
| F: GenericTrait<()> + Foo, |
| G: GenericTrait<()> + GenericTrait<u8>, |
| { |
| accepts_trait(a); |
| //~^ ERROR type mismatch resolving `<A as Trait>::Associated == ()` |
| |
| accepts_trait(b); |
| //~^ ERROR type mismatch resolving `<B as Trait>::Associated == ()` |
| |
| accepts_trait(c); |
| //~^ ERROR type mismatch resolving `<C as Trait>::Associated == ()` |
| |
| accepts_trait(d); |
| //~^ ERROR type mismatch resolving `<D as Trait>::Associated == ()` |
| |
| accepts_generic_trait(e); |
| //~^ ERROR type mismatch resolving `<E as GenericTrait<()>>::Associated == ()` |
| |
| accepts_generic_trait(f); |
| //~^ ERROR type mismatch resolving `<F as GenericTrait<()>>::Associated == ()` |
| |
| accepts_generic_trait(g); |
| //~^ ERROR type mismatch resolving `<G as GenericTrait<()>>::Associated == ()` |
| } |
| |
| fn main() { |
| accepts_trait(returns_opaque()); |
| //~^ ERROR type mismatch resolving `<impl Trait as Trait>::Associated == ()` |
| |
| accepts_trait(returns_opaque_derived()); |
| //~^ ERROR type mismatch resolving `<impl DerivedTrait as Trait>::Associated == ()` |
| |
| accepts_trait(returns_opaque_foo()); |
| //~^ ERROR type mismatch resolving `<impl Trait + Foo as Trait>::Associated == ()` |
| |
| accepts_trait(returns_opaque_derived_foo()); |
| //~^ ERROR type mismatch resolving `<impl DerivedTrait + Foo as Trait>::Associated == ()` |
| |
| accepts_generic_trait(returns_opaque_generic()); |
| //~^ ERROR type mismatch resolving `<impl GenericTrait<()> as GenericTrait<()>>::Associated == ()` |
| |
| accepts_generic_trait(returns_opaque_generic_foo()); |
| //~^ ERROR type mismatch resolving `<impl GenericTrait<()> + Foo as GenericTrait<()>>::Associated == ()` |
| |
| accepts_generic_trait(returns_opaque_generic_duplicate()); |
| //~^ ERROR type mismatch resolving `<impl GenericTrait<()> + GenericTrait<u8> as GenericTrait<()>>::Associated == ()` |
| } |