ices/88643.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#88643

#![crate_type = "lib"]

use std::collections::HashMap;

struct Widget {}

pub trait WidgetExt {
    fn set_callback<F: FnMut(&mut Self) + 'static>(&mut self, cb: F)
    where
        Self: Sized;
}

static CALLBACKS: HashMap<*const dyn WidgetExt, dyn FnMut(&mut _) + 'static> = HashMap::new();

=== stdout ===
=== stderr ===
error[E0121]: the placeholder `_` is not allowed within types on item signatures for static items
  --> /home/runner/work/glacier/glacier/ices/88643.rs:13:64
   |
13 | static CALLBACKS: HashMap<*const dyn WidgetExt, dyn FnMut(&mut _) + 'static> = HashMap::new();
   |                                                                ^ not allowed in type signatures

error: aborting due to previous error

For more information about this error, try `rustc --explain E0121`.
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