Replace some once(x).chain(once(y)) with [x, y] IntoIter
Now that we have by-value array iterators that are [already used](
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| .. | ||
| arena.rs | ||
| def.rs | ||
| definitions.rs | ||
| hir.rs | ||
| hir_id.rs | ||
| intravisit.rs | ||
| itemlikevisit.rs | ||
| lang_items.rs | ||
| lib.rs | ||
| pat_util.rs | ||
| stable_hash_impls.rs | ||
| target.rs | ||
| weak_lang_items.rs | ||