fn decode_arena_allocable_slice<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>, T: ArenaAllocatable<'tcx> + Decodable<D>>(
    decoder: &mut D
) -> &'tcx [T]Notable traits for &[u8]impl Read for &[u8]impl Write for &mut [u8]where
    D: TyDecoder,