Shuffle.is_some: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/proofs/math/random/shuffle.bend as Shuffle
Lines 26-31 of bend-collections-laws-crypto@1.0.0.0/proofs/math/random/shuffle.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/math/random/shuffle.bend&start_line=26&end_line=31

import Base

def is_some(-A: Data, m: Maybe<&2, A>) -> Bool:
  match m:
    case None{}:
      False{}
    case Some{x}:
      True{}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe