Stream.app: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/proofs/math/random/chacha8/stream.bend as Stream
Lines 14-19 of bend-collections-laws-crypto@1.0.0.0/proofs/math/random/chacha8/stream.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/math/random/chacha8/stream.bend&start_line=14&end_line=19

import Base
import bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend as W

def app(xs: List<&2, W.U64>, ys: List<&2, W.U64>) -> List<&2, W.U64>:
  match xs:
    case Nil{}:
      ys
    case Con{x, rest}:
      Con{x, app(rest, ys)}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend&name=U64