Adapting ES6 presentation example from Q to when.js

when_gen.js

var gen = require('when/generator');
gen.call(function* () {
  try {
    var [pratt, ferrell] = yield when.all([
      read("emmet.json"),
      read("lordbusiness.json")
    ]);
    render(pratt);
    render(ferrell);
  } catch (e) {
    console.log("Not Awesome: " + e);
  }
});