| //@ compile-flags: -Znext-solver |
| //@ ignore-compare-mode-next-solver (explicit revisions) |
| //@ check-pass |
| #![allow(unconditional_recursion)] |
| |
| // Test for trait-system-refactor-initiative#182 making sure |
| // that we don't incorrectly normalize to rigid aliases if the |
| // opaque type only has a trait bound. |
| |
| trait Id { |
| type This; |
| } |
| impl<T> Id for Vec<T> { |
| type This = Vec<T>; |
| } |
| fn to_assoc<T: Id>(x: T) -> <T as Id>::This { |
| todo!() |
| } |
| |
| fn mirror<T>(x: Vec<T>) -> impl Id { |
| let x = to_assoc(mirror(x)); |
| // `?x` equals `<opaque::<T> as Id>::This`. We should not infer `?x` |
| // to be a rigid alias here. |
| let _: Vec<u32> = x; |
| x |
| } |
| fn main() {} |
