Chacha8.next: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/src/math/random/chacha8.bend as Chacha8
Lines 77-85 of bend-collections-laws-crypto@1.0.0.0/src/math/random/chacha8.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/random/chacha8.bend&start_line=77&end_line=85

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

# the next 64-bit output (a refill always yields a nonempty buffer)
def next(g: ChaCha8) -> W.U64 & ChaCha8:
  match g:
    case C{+k, p, buf}:
      match buf:
        case Con{x, rest}:
          (x, C{k, p, rest})
        case Nil{}:
          pop(refill(k, p))

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/random/chacha8.bend&name=ChaCha8
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/random/chacha8.bend&name=pop
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/random/chacha8.bend&name=refill
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend&name=U64