await_thenables.js

'use strict';

// run using this fork of NodeJS
// https://github.com/targos/node/commits/v8-5.4 (https://github.com/nodejs/node/pull/8317)
//
// node --harmony_async_await await_thenables.js

function counter(count) {
  return {
    then: function(res, rej) {
      const p = Promise.resolve(count++);
      return p.then(res, rej);
    }
  }
}

;(async function start() {
  let incr = counter(1335);
  console.log(await incr); // 1335
  console.log(await incr); // 1336
  console.log(await incr); // 1337
})()