| // compile-flags: -Znext-solver |
| #![feature(rustc_attrs)] |
| |
| // A test intended to check how we handle provisional results |
| // for a goal computed with an inductive and a coinductive stack. |
| // |
| // Unfortunately this doesn't really detect whether we've done |
| // something wrong but instead only showcases that we thought of |
| // this. |
| // |
| // FIXME(-Znext-solver=coinductive): With the new coinduction approach |
| // the same goal stack can be both inductive and coinductive, depending |
| // on why we're proving a specific nested goal. Rewrite this test |
| // at that point instead of relying on `BInd`. |
| |
| |
| #[rustc_coinductive] |
| trait A {} |
| |
| #[rustc_coinductive] |
| trait B {} |
| trait BInd {} |
| impl<T: ?Sized + B> BInd for T {} |
| |
| #[rustc_coinductive] |
| trait C {} |
| trait CInd {} |
| impl<T: ?Sized + C> CInd for T {} |
| |
| impl<T: ?Sized + BInd + C> A for T {} |
| impl<T: ?Sized + CInd + C> B for T {} |
| impl<T: ?Sized + B + A> C for T {} |
| |
| fn impls_a<T: A>() {} |
| |
| fn main() { |
| impls_a::<()>(); |
| //~^ ERROR overflow evaluating the requirement `(): A` |
| } |
