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Date: Mon, 2 Mar 2015 11:11:02 +0100
CC: Daniel Lowrey <rdlowrey@php.net>,
 "internals@lists.php.net" <internals@lists.php.net>
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To: Niklas Keller <me@kelunik.com>
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Subject: Re: [PHP-DEV] [RFC Discuss] Generator Delegation
From: bobwei9@hotmail.com (Bob Weinand)

> Am 02.03.2015 um 01:17 schrieb Niklas Keller <me@kelunik.com>:
>=20
> 2015-03-02 0:52 GMT+01:00 Daniel Lowrey <rdlowrey@php.net>:
>=20
>> Hi folks,
>>=20
>> I'd like to initiate discussion on a proposal to implement generator
>> delegation via the following new syntax inside generator functions:
>>=20
>>    yield * <expr>
>>=20
>> The Generator Delegation RFC is available here:
>>=20
>> https://wiki.php.net/rfc/generator-delegation
>>=20
>> This proposal is conceptually related to (and requires functionality
>> proposed by) the forerunning Generator Return Expressions RFC here:
>>=20
>> https://wiki.php.net/rfc/generator-return-expressions
>>=20
>>=20
>> Thanks for your time,
>>=20
>> Daniel
>>=20
>=20
> The proposed syntax has an issue:
>=20
> <?php
>=20
> function a () {
>    echo yield * 3;
> }
>=20
> $a =3D a();
> $a->send(42);
>=20
> http://3v4l.org/n1sGb#v550
>=20
> This is currently valid PHP.
>=20
> Regards, Niklas

Hey,

I think we could use "yield from" as operator here.

Yes, BC. So, I won't make "from" a keyword, but rather specify an own =
token for "yield from" (T_YIELD_FROM).
That way we have no BC break, except someone tries to yield a constant =
named "from". I think that's a really minor break =E2=80=A6 and in case =
this breaks someones code, he needs to wrap the constant in parenthesis: =
"yield (from)".

We can have nice syntax here with a minimal break, so, then, why not?

Thanks,
Bob=