ices/83472.rs: fixed with errors

=== stdout ===
=== stderr ===
error: at least one trait must be specified
 --> /home/runner/work/glacier/glacier/ices/83472.rs:1:35
  |
1 | fn yes_double_ended_iterator() -> impl {
  |                                   ^^^^

error[E0658]: yield syntax is experimental
 --> /home/runner/work/glacier/glacier/ices/83472.rs:2:5
  |
2 |     yield
  |     ^^^^^
  |
  = note: see issue #43122 <rust-lang/rust#43122> for more information
  = help: add `#![feature(generators)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `83472`
 --> /home/runner/work/glacier/glacier/ices/83472.rs:1:1
  |
1 | / fn yes_double_ended_iterator() -> impl {
2 | |     yield
3 | | }
  | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/83472.rs`

error[E0627]: yield expression outside of generator literal
 --> /home/runner/work/glacier/glacier/ices/83472.rs:2:5
  |
2 |     yield
  |     ^^^^^

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0601, E0627, E0658.
For more information about an error, try `rustc --explain E0601`.
==============

Author: rustbot