/home/joneshf/programming/purescript-lens/lenslawtest.js:389
      return dict.append;
                 ^
TypeError: Cannot read property 'append' of undefined
    at Object.append (/home/joneshf/programming/purescript-lens/lenslawtest.js:389:18)
    at PS.Control.Alt (/home/joneshf/programming/purescript-lens/lenslawtest.js:549:14)
    at Object.<anonymous> (/home/joneshf/programming/purescript-lens/lenslawtest.js:561:3)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3