Was there consensus on the return value of the various generator methods being
{ value?, done? } for next/send/throw? Is it needed for close?
The desugaring for yield* in the face of using { value?, done? } is more likely
(without refutable matching or let expressions for the moment):
```js
let a = yield* EXPR;
```
```js
let a;
{
let g = EXPR;
let received = void 0, send = true, result = void 0;
try {
while (true) {
let { value, done } = send ? g.send(received) : g.throw(received);
if (done) {
result = value;
break;
}
try {
received = yield value;
send = true;
}
catch (e) {
received = e;
send = false;
}
}
}
finally {
try { g.close(); } catch (ignored) { }
}
a = result;
}
```
Ron
> -----Original Message-----
> From: [email protected] [mailto:es-discuss-
> [email protected]] On Behalf Of Brendan Eich
> Sent: Monday, April 29, 2013 9:48 AM
> To: Andy Wingo
> Cc: es-discuss
> Subject: Re: yield* desugaring
>
> Just a straw-spec device, not proposed for ES6 or 7.
>
> /be
>
> Andy Wingo wrote:
> > Hi again,
> >
> > On Mon 29 Apr 2013 17:37, Andy Wingo<[email protected]> writes:
> >
> >> let (g = EXPR) {
> >> let received = void 0, send = true;
> >> while (true) {
> >> let next = send ? g.send(received) : g.throw(received);
> >> if (next.done)
> >> break;
> >> try {
> >> received = yield next.value; // ***
> >> send = true;
> >> } catch (e) {
> >> received = e;
> >> send = false;
> >> }
> >> }
> >> next.value;
> >> }
> >
> > Beyond the scoping error of "next", this desugaring uses let
> > expressions, which AFAICS are not in the spec and have not been
> > discussed in a few years. Are they actually still a thing?
> >
> > Andy
> > _______________________________________________
> > es-discuss mailing list
> > [email protected]
> > https://mail.mozilla.org/listinfo/es-discuss
> >
> _______________________________________________
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