ices/86800.rs: fixed with errors

=== stdout ===
=== stderr ===
error[E0601]: `main` function not found in crate `86800`
  --> /home/runner/work/glacier/glacier/ices/86800.rs:1:1
   |
1  | / #![feature(type_alias_impl_trait)]
2  | |
3  | | use std::future::Future;
4  | |
...  |
38 | |     }
39 | | }
   | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/86800.rs`

error: unconstrained opaque type
  --> /home/runner/work/glacier/glacier/ices/86800.rs:19:34
   |
19 | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `TransactionFuture` must be used in combination with a concrete type within the same module

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0601`.
==============

Author: rustbot