text: /*---
  includes: []
  flags: [async]
  ---*/
  
  async function af(x) {
      const y = await new Promise(resolve => {resolve(x + 10)});
  
      return x + y;
  }
  
  af(50).then(v => {
      assert.sameValue(v, 110);
  })
  .then($DONE, $DONE);
  