Re: [PHP-DEV] [RFC][Discuss] Arrow Functions

[Nicolas Grekas]

>
> As noted in the RFC,  this isn't possible due to ambiguities with array
> keys and yield expressions with keys.
>

There are not ambiguities technically, so it is possible if we want to:

$a = [
    $y => 'b',
    ($x) => $x + 1, // key, value pair
];

$a = [
    $y => 'b',
   (($x) => $x + 1), // closure
];