chickadee » random-access-lists » ral-from-upto

function (result)
requires (and (ral? ls) (fixnum? from) (fixnum? upto)
              (fx>= from 0) (fx>= upto from)
              (fx<= upto (ral-count ls)))
ensures  (and (ral? result)
              (fx= (ral-count result) (fx- upto from)))