List.append: def of Base
Import: import Base
Lines 932-937 of Base/base.bend: https://jend.leeeet.dev/read.txt?path=Base/base.bend&start_line=932&end_line=937

import Base

def List.append(a, -A: Kind(a), xs: List<a, A>, ys: List<a, A>) -> List<a, A>:
  match xs:
    case Nil{}:
      ys
    case h <> t:
      h <> List.append(a, A, t, ys)

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