Hi Andy, I'm sorry for what looks to you like black-holing. I admit
Rick's notes are terse but that shouldn't be taken for "brusque", and
where they need supplementation, I try to post followups to es-discuss.
However, in this case I don't think the charge is fair to TC39 in full.
I'm a long-time champion (probably erstwhile at this point) of
generators, and I did reply to es-discuss about the history and
rationale for forcing a return instead of using an exception.
I think Dave lacks time to keep up with es-discuss, but you can always
reach out to him by email. Anyway, you don't need him here, you've heard
from at least Allen and me on this list.
/be
Andy Wingo wrote:
Hi,
I would like to register a gripe. I have been unhappy with my
interactions with TC39 since things started happening more in F2F
meetings and private mails than online. I wish that people would do
things more on es-discuss. As an example:
On Tue 05 Aug 2014 18:30, Rick Waldron<[email protected]> writes:
> ## Short discussion about making generator.return() throw a special
> exception.
>
> DH: Want to bring up Andy Wingo's preference (discussed on es-discuss)
> for modeling return() as an exception rather than a return.
>
> General opposition.
>
> #### Conclusion/resolution
>
> - keep as is: return() method produces a return control flow, not an
> exception
No reason, no response on the list to the salient points, no response
from Dave Herman; too bad.
> ## Yield *
>
> AWB: Does an internal throw
>
> When a `generator.throw()` is called and the generator has a yield* the
> spec currently calls `throw` in the yield* expression
>
> DH: Call return() on the outer generator, delegates calling return() to
> the delegated `yield *`
This kind of proposal is particularly egregious as a
way-past-the-last-minute semantic change that was proposed only at a F2F
meeting without any other possible input, even from generators
"champions" (if I am that any more). The discussion has people
participating that never post on the list.
Note that in this particular case the semantics of a return() are fully
specified with the old agreed semantics if return() is implemented as an
exception.
Grumpily yours,
Andy
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