如何使用IcedCoffeeScript正确处理错误？

It is common practice in node.js to return error message as the first argument to a callback function. There are a number of solutions to this problem in pure JS (Promise, Step, seq, etc), but none of them seem to be integrable with ICS. What would be correct solution to handle errors without losing much of readability?It is common practice in node.js to return erro