Node.js call/cc function with fibers

gistfile1.js

/* This is the call-with-current-continuation found in Scheme and other
 * Lisps. It captures the current call context and passes a callback to
 * resume it as an argument to the function. Here, I've modified it to fit
 * JavaScript and node.js paradigms by making it a method on Function
 * objects and using function (err, result) style callbacks.
 */
Function.prototype.callcc = function(context  /* args... */) {
  var that = this,
      caller = Fiber.current,
      fiber = Fiber(function () {
        that.apply(context, Array.prototype.slice.call(arguments, 1).concat(
          function (err, result) {
            if (err)
              caller.throwInto(err)
            else
              caller.run(result)
          }
        ))
      })
  process.nextTick(fiber.run.bind(fiber))
  return Fiber.yield()
}