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

issue の PHP スニペットを使って報告された動作を再現し、その後、nullsafe operator に関するリンク先の RFC と、nullsafe 呼び出しに関する既存の実装およびテストを確認してください。$g?() の意図された扱いを特定して実装し、通常の呼び出しに対して文書化されたエラーを維持し、期待される動作に一致させれば完了です。