{
  "$type": "site.standard.document",
  "bskyPostRef": {
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  "path": "/t/could-you-borrow-a-bit/24300#post_7",
  "publishedAt": "2026-05-15T13:43:13.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "A particularly fun question for bitstring reference type libraries like what I'm writing is: is how do you implement `split_at_mut`?\n\nSo far my answer is: you don't. But if the language supported mutable borrow splitting at a sub-byte granularity, then it could be possible.",
  "title": "Could you borrow a bit?"
}