q_play.coffee

a = ->
  foo = q.defer()
  return foo.promise

b = a.reject (e) -> return e
b.then(c) ->
  bar = q.defer()
  return bar.promise

q_play.js

q = require('q');

a = function() {
  var foo = q.defer();
  return foo.promise;
};

b = a.reject(function(e) {
  return e;
});

b.then(c)(function() {
  var bar = q.defer();
  return bar.promise;
});