{
  "$type": "site.standard.document",
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  "path": "/t/when-will-the-constant-iterators-be-implemented/24192#post_1",
  "publishedAt": "2026-04-23T06:48:18.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "In the Rust, constant traits can be used by unstable features. But who can tell me why some iterators is not constant (Like `map`)? ans why some constant iterators can't be create by their constructed function (Like `once` and `empty`)? When these constant iterator supports will be implemented?",
  "title": "When will the constant iterators be implemented?"
}