signature MLTON_WORD =
   sig
      type t
         
      val rol: t * word -> t
      val ror: t * word -> t
   end

• type t

the type of words. For MLton.Word this is Word.word, for MLton.Word8 this is Word8.word.

• rol (w, w')

rotates left (circular).

• ror (w, w')

rotates right (circular).