```
constructor(x) {
super(x);
Object.defineProperties(this, { then: { value: this.then }});
Object.freeze(this);
if (this.constructor==DefensivePromise && this.then ===
DefensivePromise.prototype.then) {
goodPromises.add(this);
}
}
```
Getting closer, I hope!
> I also like the point implicit in your attack that I also need the
> invariant that
>
> DefensivePromise.resolve(anything).then(anycallback)
>
> should all callback at most once.
>
I believe this is already taken care of by the ES6 spec once you make it
into `NewPromiseCapability`. At least I wrote tests for `es6-shim` once
upon a time purporting to show this.
--scott
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