ices/64537.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#64537

#![feature(const_generics)]

struct S;

impl S {
    pub fn x<const I: usize>() {}
    pub fn y() {
        Self::x::<{3usize}>();
    }
}

fn main() {}

=== stdout ===
=== stderr ===
warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/64537.rs:1:12
  |
1 | #![feature(const_generics)]
  |            ^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information

warning: unnecessary braces around const expression
 --> /home/runner/work/glacier/glacier/ices/64537.rs:8:19
  |
8 |         Self::x::<{3usize}>();
  |                   ^^^^^^^^ help: remove these braces
  |
  = note: `#[warn(unused_braces)]` on by default

warning: struct is never constructed: `S`
 --> /home/runner/work/glacier/glacier/ices/64537.rs:3:8
  |
3 | struct S;
  |        ^
  |
  = note: `#[warn(dead_code)]` on by default

warning: associated function is never used: `x`
 --> /home/runner/work/glacier/glacier/ices/64537.rs:6:12
  |
6 |     pub fn x<const I: usize>() {}
  |            ^

warning: associated function is never used: `y`
 --> /home/runner/work/glacier/glacier/ices/64537.rs:7:12
  |
7 |     pub fn y() {
  |            ^

warning: 5 warnings emitted

==============