Thanks! I see now. On Thu, Jan 19, 2017, 12:30 Boris Zbarsky <[email protected]> wrote:
> On 1/19/17 12:24 PM, Isiah Meadows wrote: > > 1. What does Firefox do with the getter on non-errors? > > Oh, I didn't make that clear, did I? On a non-error in the getter, we > have an Error object or Error.prototype (which appeared somewhere on our > receiver's proto chain). Those objects all have, in Spidermonkey, an > internal slot that stores information about the stack. The getter uses > the information in that internal slot to create a string and return it. > > > 2. How breaking is having the getter and setter throwing on non-errors? > > Well, when we tried to do it it didn't even pass our test automation, so... > > In particular it would throw on anyone doing ES5-style subclassing of > Error and then doing anything with .stack. > > > I'm struggling to see how it'd be that breaking. It's a getter, not a > > method, so it requires a call to `__locateGetter__` or > > `Object.defineProperty` to even access. > > No, it just requires that you have an Error on your prototype chain but > not be an Error yourself, and suddenly you have exceptions everywhere. > > -Boris >
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