def off.take_len

bend-osdev-bytes@0.1.1.0 · PROOF.bend:1330

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

1330def off.take_len(ws: List<&2, B.OctByte>) -> {B.w8s.take(List.length(&2, B.OctByte, ws), ws) == ws : List<&2, B.OctByte>}:
1331  match ws:
1332    case Nil{}:
1333      {==}
1334    case Con{h, t}:
1335      Equal.cong(List<&2, B.OctByte>, List<&2, B.OctByte>, l => Con{h, l}, B.w8s.take(List.length(&2, B.OctByte, t), t), t, off.take_len(t))