{
  "$type": "site.standard.document",
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  "path": "/t/interiorassign-trait-a-b/24291?page=2#post_27",
  "publishedAt": "2026-05-11T17:33:47.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "To be pedantic, `:=` always denotes defining some new binding, not mutation or interior mutation. Rust has `let` and `let mut` instead of `:=`, but this does leave `:=` free for other uses. Instead Rust should never use `:=` for anything.\n\nNow one could consider safer partial initialisation than `MaybeUninit`, but recent conversations suggest other ideas, probably adding some new assignment syntax. And really tricky stuff like partial initialisation should probably not benefit from really short syntax.",
  "title": "InteriorAssign trait { a := b }"
}