Ed25519.first: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/crypto/ed25519.bend as Ed25519
Lines 196-205 of bend-collections-laws-crypto@1.0.0.0/spec/crypto/ed25519.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/ed25519.bend&start_line=196&end_line=205

import Base

def first(n: Nat, xs: List<&2, U32>) -> List<&2, U32>:
  match n:
    case 0n:
      Nil{}
    case 1n+m:
      match xs:
        case Nil{}:
          Nil{}
        case Con{x, xt}:
          Con{x, first(m, xt)}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32