| // Example cycle where a bound on `T` uses a shorthand for `T`. This |
| // creates a cycle because we have to know the bounds on `T` to figure |
| // out what trait defines `Item`, but we can't know the bounds on `T` |
| // without knowing how to handle `T::Item`. |
| // |
| // Note that in the future cases like this could perhaps become legal, |
| // if we got more fine-grained about our cycle detection or changed |
| // how we handle `T::Item` resolution. |
| |
| use std::ops::Add; |
| |
| // Preamble. |
| trait Trait { type Item; } |
| |
| struct A<T> |
| where T : Trait, |
| T : Add<T::Item> |
| //~^ ERROR cycle detected |
| { |
| data: T |
| } |
| |
| fn main() { |
| } |
