| // Test that regions which appear only in the closure's generics (in |
| // this case, `'a`) are properly mapped to the creator's generics. In |
| // this case, the closure constrains its type parameter `T` to outlive |
| // the same `'a` for which it implements `Trait`, which can only be the `'a` |
| // from the function definition. |
| |
| // compile-flags:-Zverbose-internals |
| |
| #![feature(rustc_attrs)] |
| #![allow(dead_code)] |
| |
| trait Trait<'a> {} |
| |
| fn establish_relationships<T, F>(value: T, closure: F) |
| where |
| F: FnOnce(T), |
| { |
| closure(value) |
| } |
| |
| fn require<'a, T>(t: T) |
| where |
| T: Trait<'a> + 'a, |
| { |
| } |
| |
| #[rustc_regions] |
| fn supply<'a, T>(value: T) |
| where |
| T: Trait<'a>, |
| { |
| establish_relationships(value, |value| { |
| // This function call requires that |
| // |
| // (a) T: Trait<'a> |
| // |
| // and |
| // |
| // (b) T: 'a |
| // |
| // The latter does not hold. |
| |
| require(value); |
| //~^ ERROR the parameter type `T` may not live long enough |
| }); |
| } |
| |
| fn main() {} |