Common.append: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/spec/lib/common.bend as Common
Lines 133-138 of bend-collections-laws-math@1.0.0.0/spec/lib/common.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/spec/lib/common.bend&start_line=133&end_line=138

import Base

def append(-A: Data, xs: List<&2, A>, ys: List<&2, A>) -> List<&2, A>:
  match xs:
    case Nil{}:
      ys
    case Con{h, t}:
      Con{h, append(A, t, ys)}

Uses (1):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List