def off.take_drop

bend-osdev-bytes@0.1.1.0 · PROOF.bend:885

import Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B

885def off.take_drop(+i: Nat, +j: Nat, ws: List<&2, B.OctByte>) -> {B.w8s.take(i, B.w8s.drop(j, ws)) == B.w8s.drop(j, B.w8s.take(Nat.add(j, i), ws)) : List<&2, B.OctByte>}:
886  match j ws:
887    case 0n _:
888      {==}
889    case 1n+q Nil{}:
890      off.take_nil(i)
891    case 1n+q Con{x, t}:
892      off.take_drop(i, q, t)