ices/105819.rs: fixed with no errors

=== stdout ===
=== stderr ===
warning: unused variable: `x`
  --> /home/runner/work/glacier/glacier/ices/105819.rs:12:9
   |
12 |     let x = move || {
   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: unused variable: `a`
  --> /home/runner/work/glacier/glacier/ices/105819.rs:13:18
   |
13 |         let Foo((a, b)) = foo;
   |                  ^ help: if this is intentional, prefix it with an underscore: `_a`

warning: unused variable: `b`
  --> /home/runner/work/glacier/glacier/ices/105819.rs:13:21
   |
13 |         let Foo((a, b)) = foo;
   |                     ^ help: if this is intentional, prefix it with an underscore: `_b`

warning: function `upvar` is never used
 --> /home/runner/work/glacier/glacier/ices/105819.rs:6:4
  |
6 | fn upvar() {
  |    ^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: 4 warnings emitted

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