Rand.pow2mod: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/math/random/rand.bend as Rand
Lines 45-50 of bend-collections-laws-crypto@1.0.0.0/spec/math/random/rand.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/math/random/rand.bend&start_line=45&end_line=50

import Base

def pow2mod(w: Nat, +n: Nat) -> Nat:
  match w:
    case 0n:
      Nat.mod(1n, n)
    case 1n+k:
      Nat.mod(Nat.double(pow2mod(k, n)), n)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.double
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.mod