Coffeescript 为什么下面的for循环没有打印任何内容？

因此，控制台中没有打印任何内容。我做错了什么？

翻译成以下JavaScript：

ages = {paul: 11, rick: 7 }

for n,a in ages
  console.log("names: #{n}, ages: #{a}")

var a, ages, n, _i, _len;

ages = {
  paul: 11,
  rick: 7
};

for (a = _i = 0, _len = ages.length; _i < _len; a = ++_i) {
  n = ages[a];
  console.log("names: " + n + ", ages: " + a);
}

var a, ages, n;

ages = {
  paul: 11,
  rick: 7
};

for (n in ages) {
  a = ages[n];
  console.log("names: " + n + ", ages: " + a);
}