ices/99575.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#99575

use std::pin::Pin;

fn main() {
    let a = Enum::A(Pin::new(Box::new(A())));
    let b = Enum::B(Pin::new(Box::new(B())));
    println!("{:?} {:?}", a, b);
}

#[derive(Debug)]
enum Enum {
    A(Pin<Box<A>>),
    B(Pin<Box<B>>),
}

#[derive(Debug)]
struct A();

impl Drop for Pin<Box<A>> {
    fn drop(&mut self) {}
}

#[derive(Debug)]
struct B();

// UNCOMMENT TO FIX COMPILER ERROR
// impl Drop for Pin<Box<B>> {
//     fn drop(&mut self) {}
// }

=== stdout ===
=== stderr ===
error[E0120]: the `Drop` trait may only be implemented for local structs, enums, and unions
  --> /home/runner/work/glacier/glacier/ices/99575.rs:18:15
   |
18 | impl Drop for Pin<Box<A>> {
   |               ^^^^^^^^^^^ must be a struct, enum, or union in the current crate

error: aborting due to previous error

For more information about this error, try `rustc --explain E0120`.
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