ices/83893.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#83893

#[lang = "add"]
trait Add<'a, T> {}
fn ice() {
    r + a
}

=== stdout ===
=== stderr ===
error[E0425]: cannot find value `r` in this scope
 --> /home/runner/work/glacier/glacier/ices/83893.rs:4:5
  |
4 |     r + a
  |     ^ not found in this scope

error[E0425]: cannot find value `a` in this scope
 --> /home/runner/work/glacier/glacier/ices/83893.rs:4:9
  |
4 |     r + a
  |         ^ not found in this scope

error[E0658]: language items are subject to change
 --> /home/runner/work/glacier/glacier/ices/83893.rs:1:1
  |
1 | #[lang = "add"]
  | ^^^^^^^^^^^^^^^
  |
  = help: add `#![feature(lang_items)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `83893`
 --> /home/runner/work/glacier/glacier/ices/83893.rs:1:1
  |
1 | / #[lang = "add"]
2 | | trait Add<'a, T> {}
3 | | fn ice() {
4 | |     r + a
5 | | }
  | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/83893.rs`

error[E0152]: found duplicate lang item `add`
 --> /home/runner/work/glacier/glacier/ices/83893.rs:2:1
  |
2 | trait Add<'a, T> {}
  | ^^^^^^^^^^^^^^^^^^^
  |
  = note: the lang item is first defined in crate `core` (which `std` depends on)
  = note: first definition in `core` loaded from /usr/share/rust/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-c8ded1707ad10767.rlib
  = note: second definition in the local crate (`83893`)

error[E0718]: `add` language item must be applied to a trait with 1 generic argument
 --> /home/runner/work/glacier/glacier/ices/83893.rs:1:1
  |
1 | #[lang = "add"]
  | ^^^^^^^^^^^^^^^
2 | trait Add<'a, T> {}
  |          ------- this trait has 2 generic arguments, not 1

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0152, E0425, E0601, E0658, E0718.
For more information about an error, try `rustc --explain E0152`.
==============