You can't extend promises in node 0.12.0

extendedpromise.js

function ExtendedPromise (resolver) {
    Promise.call(this, resolver)
}

require('util').inherits(ExtendedPromise, Promise)
ExtendedPromise.__proto__ = Promise

new ExtendedPromise(function (resolve) {
    resolve(1)
}).then(console.log)

output.txt

$ node extendedpromise.js
/Users/benglish/extendedpromise.js:2
  Promise.call(this, resolver)
          ^
TypeError: #<ExtendedPromise> is not a promise
    at new ExtendedPromise (/Users/benglish/extendedpromise.js:2:11)
    at Object.<anonymous> (/Users/benglish/extendedpromise.js:8:5)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

Note: the iojs ES6 version of this seems to work:

class ExtendedPromise extends Promise {}

new ExtendedPromise(function (resolve) {
    resolve(1)
}).then(console.log)

// 1