Support for nullsafe function call syntax

Description

The following code:

<?php
class Foo {
    public function __invoke(): string {
        return 'foo invoked';
    }
}

$f = new Foo();
var_Dump($f());

results in this expected output:

string(11) "foo invoked"

$g = null;
$g();

results in this expected output

Fatal error: Uncaught Error: Value of type null is not callable

$g = null;
$g?->__invoke();

results in this expected output:

string(11) "foo invoked"

As the call to ->__invoke() can be shortened to () I would have expected to be able to use the nullsafe operator here as well and write

$g = null;
$g?();

But this results in in this output:

Parse error: syntax error, unexpected token ")"

I would have expected

string(11) "foo invoked"

Is this on purpose? I could not find any mention of invoke in the RFC. So was this overseen?

See also https://3v4l.org/n09i2

PHP Version

All currently supported PHP-Versions

Operating System

No response

Reproduisez le comportement signalé à l’aide des extraits PHP de l’issue, puis lisez le RFC lié sur l’opérateur nullsafe ainsi que l’implémentation et les tests existants pour les appels nullsafe. Le travail est terminé lorsque le traitement prévu de $g?() a été déterminé et implémenté, tout en préservant les erreurs documentées pour les appels ordinaires et en correspondant au comportement attendu.