ices/103708.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#103708

#![feature(min_specialization)]

trait Dance {
    fn foo();
}

impl<'a, T> Dance for T {
    fn foo() {}
}

impl Dance for bool {
    fn foo() {}
}

fn main() {}

=== stdout ===
=== stderr ===
error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
  --> /home/runner/work/glacier/glacier/ices/103708.rs:12:5
   |
7  | impl<'a, T> Dance for T {
   | ----------------------- parent `impl` is here
...
12 |     fn foo() {}
   |     ^^^^^^^^ cannot specialize default item `foo`
   |
   = note: to specialize, `foo` in the parent `impl` must be marked `default`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0520`.
==============