| // Test that we correctly infer variance for type parameters in |
| // various types and traits. |
| |
| #![feature(rustc_attrs)] |
| |
| #[rustc_variance] |
| struct TestImm<A, B> { //~ ERROR [+, +] |
| x: A, |
| y: B, |
| } |
| |
| #[rustc_variance] |
| struct TestMut<A, B:'static> { //~ ERROR [+, o] |
| x: A, |
| y: &'static mut B, |
| } |
| |
| #[rustc_variance] |
| struct TestIndirect<A:'static, B:'static> { //~ ERROR [+, o] |
| m: TestMut<A, B> |
| } |
| |
| #[rustc_variance] |
| struct TestIndirect2<A:'static, B:'static> { //~ ERROR [o, o] |
| n: TestMut<A, B>, |
| m: TestMut<B, A> |
| } |
| |
| trait Getter<A> { |
| fn get(&self) -> A; |
| } |
| |
| trait Setter<A> { |
| fn set(&mut self, a: A); |
| } |
| |
| #[rustc_variance] |
| struct TestObject<A, R> { //~ ERROR [o, o] |
| n: Box<dyn Setter<A>+Send>, |
| m: Box<dyn Getter<R>+Send>, |
| } |
| |
| fn main() {} |