Why wouldn’t you accept a &mut [MaybeUninit<T>] and return a &mut [u8], hiding the unsafe bits that transmute the underlying reference?

Something like:

  fn convert<'i, 'o>(inp: &'i [u8], buf: &'o mut MaybeUninit<u8>) -> &'o mut [u8]

(Honest question, actually… because the above may be impossible to write and I’m on my phone and can’t try it.)

Edit: it works: https://play.rust-lang.org/?version=stable&mode=debug&editio...