ices/82830.rs: fixed with errors

=== stdout ===
=== stderr ===
error[E0275]: overflow evaluating the requirement `P: Sized`
 --> /home/runner/work/glacier/glacier/ices/82830.rs:6:8
  |
6 |     t: MaybeBox<P>
  |        ^^^^^^^^^^^
  |
note: required because of the requirements on the impl of `A<P, Box<P>>` for `P`
 --> /home/runner/work/glacier/glacier/ices/82830.rs:8:12
  |
8 | impl<Y, N> A<Y, N> for P {
  |            ^^^^^^^     ^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0275`.
==============

Author: rustbot