ices/67166.rs: fixed with errors (#286)

=== stdout ===
=== stderr ===
warning: the feature `impl_trait_in_bindings` is incomplete and may cause the compiler to crash
 --> /home/runner/work/glacier/glacier/ices/67166.rs:1:12
  |
1 | #![feature(impl_trait_in_bindings)]
  |            ^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default

error[E0720]: opaque type expands to a recursive type
 --> /home/runner/work/glacier/glacier/ices/67166.rs:5:19
  |
5 |     let _foo: Box<impl Copy + '_> = Box::new(());
  |                   ^^^^^^^^^^^^^^ expands to a recursive type
  |
  = note: type resolves to itself

error: aborting due to previous error

For more information about this error, try `rustc --explain E0720`.
==============

Co-authored-by: rustbot <[email protected]>