Rand.swap_m: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/src/math/random/rand.bend as Rand
Lines 270-275 of bend-collections-laws-crypto@1.0.0.0/src/math/random/rand.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/random/rand.bend&start_line=270&end_line=275

import Base

def swap_m(-A: Data, xs: List<&2, A>, +i: Nat, +j: Nat, a: Maybe<&2, A>, b: Maybe<&2, A>) -> List<&2, A>:
  match a b:
    case Some{x} Some{y}:
      put(A, put(A, xs, i, y), j, x)
    case _ _:
      xs

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/random/rand.bend&name=put