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Date: Tue, 31 Jan 2017 11:34:12 -0700
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Subject: Re: [RFC][Discuss] Arrow Functions
From: levim@php.net (Levi Morrison)

On Mon, Jan 30, 2017 at 10:55 AM, Levi Morrison <levim@php.net> wrote:
> Bob Weinand and I are happy to announce that the [Arrow Functions][1]
> RFC is moving into the public discussion phase. We have been
> collaborating on this RFC for many months now and finally have a
> proposal we are happy to discuss in the open.
>
> Here is an example of an existing closure:
>
>     function ($x) use ($arr) {
>         return $arr[$x];
>     }
>
> This RFC proposes syntax and semantics to simplify this common usage to:
>
>     fn($x) => $arr[$x]
>
> More details are in the RFC. The [implementation][2] currently has no
> known issues and is ready for you to download, build and test, which
> we encourage you to do.
>
> We look forward to a productive discussion period and are happy to
> answer questions.
>
> For historical purposes, the revision of this RFC is currently at
> [1485798604][3].
>
>   [1]: https://wiki.php.net/rfc/arrow_functions
>   [2]: https://github.com/morrisonlevi/php-src/tree/arrow_functions
>   [3]: https://wiki.php.net/rfc/arrow_functions?rev=1485798604

Thank you to everyone who has participated in the discussion so far.
Several people have asked for examples of type declarations. I have
updated the RFC accordingly and also added an example for by-ref
parameters and returns. Here are the examples:

    fn (array $x) => $x
    fn (): int => 42
    fn &(array &$xs) => $xs

I have also made some minor improvements to the formatting in various places.