ices/66962.rs: fixed with no errors

=== stdout ===
=== stderr ===
warning: the feature `const_generics` is incomplete and may cause the compiler to crash
 --> /home/runner/work/glacier/glacier/ices/66962.rs:1:12
  |
1 | #![feature(const_generics)]
  |            ^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default

warning: struct is never constructed: `B`
 --> /home/runner/work/glacier/glacier/ices/66962.rs:8:8
  |
8 | struct B<const CFG: Config> {
  |        ^
  |
  = note: `#[warn(dead_code)]` on by default

==============

Author: rustbot