Rand.uint64n_pick: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend as Rand
Lines 159-164 of bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend&start_line=159&end_line=164

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

def uint64n_pick(~S: Data, ~next: S -> W.U64 & S, s: S, +n: W.U64, pow2: Bool) -> W.U64 & S:
  match pow2:
    case True{}:
      mask(S, n, next(s))
    case False{}:
      lemire_first(~S, ~next, n, draw(S, n, next(s)))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend&name=draw
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend&name=lemire_first
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/random/rand.bend&name=mask
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/u64.bend&name=U64