ices/86642.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#86642

#![feature(impl_trait_in_bindings)]
#![allow(incomplete_features)]

macro_rules! seq {
    ($( $x:expr ),*) => {
        move |source| {
            $(
                let source = $x(source)?;
            )*
            Ok(source)
        }
    };
}

macro_rules! alt {
    ($first:expr, $( $rest:expr ),*) => {
        move |source| {
            let res = $first(source);
            $(
                let res = res.or($rest(source));
            )*
            res
        }
    };
}

static x: impl Fn(&str) -> Result<&str, ()> = alt!(seq!(), seq!());

=== stdout ===
=== stderr ===
error[E0557]: feature has been removed
 --> /home/runner/work/glacier/glacier/ices/86642.rs:1:12
  |
1 | #![feature(impl_trait_in_bindings)]
  |            ^^^^^^^^^^^^^^^^^^^^^^ feature has been removed
  |
  = note: the implementation was not maintainable, the feature may get reintroduced once the current refactorings are done

error[E0562]: `impl Trait` not allowed outside of function and method return types
  --> /home/runner/work/glacier/glacier/ices/86642.rs:27:11
   |
27 | static x: impl Fn(&str) -> Result<&str, ()> = alt!(seq!(), seq!());
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0601]: `main` function not found in crate `86642`
  --> /home/runner/work/glacier/glacier/ices/86642.rs:1:1
   |
1  | / #![feature(impl_trait_in_bindings)]
2  | | #![allow(incomplete_features)]
3  | |
4  | | macro_rules! seq {
...  |
26 | |
27 | | static x: impl Fn(&str) -> Result<&str, ()> = alt!(seq!(), seq!());
   | |___________________________________________________________________^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/86642.rs`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0557, E0562, E0601.
For more information about an error, try `rustc --explain E0557`.
==============

[Alexendoo]

(I'm working through these)