ProofSeq.unpack_length: law of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/proof_seq.bend as ProofSeq
Lines 136-138 of lawful-bytes@0.1.1.0/proof_seq.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/proof_seq.bend&start_line=136&end_line=138

import Base
import lawful-bytes@0.1.1.0/defs.bend as D

law unpack_length:
  for +ws: List<&2, U32>
  {List.length(&2, U32, D.unpack(ws)) == Nat.mul(4n, List.length(&2, U32, ws)) : Nat}

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.trans
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.length
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=unpack
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/proof_seq.bend&name=unpack_length4
  https://jend.leeeet.dev/definition.txt?path=lawful-words@0.1.0.0/proof_nat.bend&name=mul_comm