ices/78336.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#78336

fn finds_explicit_bound<'b>() -> impl 'b {
    yield
}

fn main() {}

=== stdout ===
=== stderr ===
error: at least one trait must be specified
 --> /home/runner/work/glacier/glacier/ices/78336.rs:1:34
  |
1 | fn finds_explicit_bound<'b>() -> impl 'b {
  |                                  ^^^^^^^

error[E0658]: yield syntax is experimental
 --> /home/runner/work/glacier/glacier/ices/78336.rs:2:5
  |
2 |     yield
  |     ^^^^^
  |
  = note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
  = help: add `#![feature(generators)]` to the crate attributes to enable

error[E0627]: yield expression outside of generator literal
 --> /home/runner/work/glacier/glacier/ices/78336.rs:2:5
  |
2 |     yield
  |     ^^^^^

error: aborting due to 3 previous errors

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