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Date: Thu, 1 Oct 2015 09:11:12 +0200
Message-ID: <CAB6YZuz4+P4VmSeqAxawasmA32DFZ3azAc9VSa2Mbea-4XLDWw@mail.gmail.com>
To: Levi Morrison <levim@php.net>
Cc: internals <internals@lists.php.net>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [PHP-DEV] Arrow function expressions in PHP
From: pajousek@gmail.com (=?UTF-8?Q?Pavel_Kou=C5=99il?=)

On Tue, Sep 29, 2015 at 11:55 PM, Levi Morrison <levim@php.net> wrote:

> Reading over the list I don't think people "are torn about" it. There
> are some detractors, sure, but there seem to be more detractors about
> symbol choice (~) and lack of type declarations.

Personally, I feel that without the auto import, the feature would be
totally useless. But yes, more people are not happy with the ~ choice.

> I disagree that `(int $x) => $x * 2` is vastly better than `fn (int
> $x) => $x * 2`. It *might* be better but so much better we should
> introduce backtracking into it? In my opinion that is very clear: no.
> Especially because this also makes it harder to write other tools for
> PHP.

The issue I have with the fn() prefix is that it looks "weird" in case
you are chaining multiples. And it looks like a function call, but it
isn't one.

fn($x) => fn($y) => fn($z)

How does hack solve this? Do they have backtracking in their parser?