ices/83630.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#83630

#![crate_type = "staticlib"]
static DATA: Iterator<Item = _> = "my string";

=== stdout ===
=== stderr ===
warning: trait objects without an explicit `dyn` are deprecated
 --> /home/runner/work/glacier/glacier/ices/83630.rs:2:14
  |
2 | static DATA: Iterator<Item = _> = "my string";
  |              ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = _>`
  |
  = note: `#[warn(bare_trait_objects)]` on by default
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
  = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>

error[E0121]: the type placeholder `_` is not allowed within types on item signatures
 --> /home/runner/work/glacier/glacier/ices/83630.rs:2:30
  |
2 | static DATA: Iterator<Item = _> = "my string";
  |                              ^ not allowed in type signatures

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0121`.
==============