message: Remove uses of alloc::prelude
  alloc::prelude has been removed in effective since nightly-2021-10-17.
diff: // http://opensource.org/licenses/MIT>, at your option. This file may not be
  // copied, modified, or distributed except according to those terms.
  -use alloc::prelude::v1::Box;
  -use alloc::vec::Vec;
  +use alloc::{boxed::Box, vec::Vec};
  use core::mem;
  #[cfg(target_arch = "x86_64")]
  