ices/87750.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#87750

#![feature(generic_associated_types)]
use std::rc::Rc;
use std::ops::Deref;

trait PointerFamily {
    type Pointer<T>: Deref<Target=T> + Sized;

    fn new<T>(obj: T) -> Self::Pointer<T>;
}

#[derive(Debug)]
struct RcFamily;

impl PointerFamily for RcFamily {
    type Pointer<T> = Rc<T>;

    fn new<T>(obj: T) -> Rc<T> {
        Rc::new(obj)
    }
}

#[derive(Debug)]
enum Node<T, P: PointerFamily> where P::Pointer<Node<T, P>>: Sized {
    Cons(T, P::Pointer<Node<T, P>>),
    Nil
}

type List<T, P> = <P as PointerFamily>::Pointer<Node<T, P>>;
type RcList<T> = List<T, RcFamily>;
type RcNode<T> = Node<T, RcFamily>;

impl<T, P: PointerFamily> Node<T, P> where P::Pointer<Node<T, P>>: Sized {
    fn new() -> P::Pointer<Self> {
        P::new(Self::Nil)
    }

    fn cons(head: T, tail: P::Pointer<Self>) -> P::Pointer<Self> {
        P::new(Self::Cons(head, tail))
    }
}

fn main() {
    let mut list: RcList<i32> = RcNode::<i32>::new();
    list = RcNode::<i32>::cons(1, list);
    //println!("{:?}", list);

}

=== stdout ===
=== stderr ===
error[E0599]: the variant or associated item `new` exists for enum `Node<i32, RcFamily>`, but its trait bounds were not satisfied
  --> /home/runner/work/glacier/glacier/ices/87750.rs:43:48
   |
23 | enum Node<T, P: PointerFamily> where P::Pointer<Node<T, P>>: Sized {
   | ------------------------------------------------------------------
   | |
   | variant or associated item `new` not found here
   | doesn't satisfy `Node<i32, RcFamily>: Sized`
...
43 |     let mut list: RcList<i32> = RcNode::<i32>::new();
   |                                                ^^^ variant or associated item cannot be called on `Node<i32, RcFamily>` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `Node<i32, RcFamily>: Sized`

error[E0275]: overflow evaluating the requirement `Node<i32, RcFamily>: Sized`
  --> /home/runner/work/glacier/glacier/ices/87750.rs:43:19
   |
43 |     let mut list: RcList<i32> = RcNode::<i32>::new();
   |                   ^^^^^^^^^^^

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0275, E0599.
For more information about an error, try `rustc --explain E0275`.
==============