Esteban Küber 5eac9c0056 Excercise const trait interaction with default fields
Add a test case for using the result of a fn call of an associated
function of a `const` trait in a struct default field.

```rust
struct X;
trait Trait {
    fn value() -> Self;
}
impl const Trait for X {
    fn value() -> Self { X }
}
struct S<T: const Trait> {
    a: T = T::value(),
}
```
2024-12-10 17:49:46 +00:00
..
2024-12-09 21:58:07 +00:00