Ed25519.cat: 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 218-223 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=218&end_line=223

import Base

def cat(xs: List<&2, U32>, ys: List<&2, U32>) -> List<&2, U32>:
  match xs:
    case Nil{}:
      ys
    case Con{x, xt}:
      Con{x, cat(xt, ys)}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32