ices/110696.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#110696

#![feature(type_alias_impl_trait)]

use std::marker::PhantomData;


trait MyIndex<T> {
    type O;
    fn my_index(self) -> Self::O;
}
trait MyFrom<T>: Sized {
    type Error;
    fn my_from(value: T) -> Result<Self, Self::Error>;
}


trait F {}
impl F for () {}
type DummyT<T> = impl F;
fn _dummy_t<T>() -> DummyT<T> {}

struct Phantom1<T>(PhantomData<T>);
struct Phantom2<T>(PhantomData<T>);
struct Scope<T>(Phantom2<DummyT<T>>);

impl<T> Scope<T> {
    fn new() -> Self {
        unimplemented!()
    }
}

impl<T> MyFrom<Phantom2<T>> for Phantom1<T> {
    type Error = ();
    fn my_from(_: Phantom2<T>) -> Result<Self, Self::Error> {
        unimplemented!()
    }
}

impl<T: MyFrom<Phantom2<DummyT<U>>>, U> MyIndex<DummyT<T>> for Scope<U> {
    type O = T;
    fn my_index(self) -> Self::O {
        MyFrom::my_from(self.0).ok().unwrap()
    }
}

fn main() {
    let _pos: Phantom1<DummyT<()>> = Scope::new().my_index();
}

=== stdout ===
=== stderr ===
error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
  --> /home/runner/work/glacier/glacier/ices/110696.rs:38:6
   |
38 | impl<T: MyFrom<Phantom2<DummyT<U>>>, U> MyIndex<DummyT<T>> for Scope<U> {
   |      ^ unconstrained type parameter

error: aborting due to previous error

For more information about this error, try `rustc --explain E0207`.
==============