Description:
------------
In the case that you have a match statement and the expression in one of the branches is a function that returns `void`, there is no mention what is the expected behavior in the documentation. Right now it seems that it evaluates to `NULL`. 

This behavior is not well understood as can be seen here: https://github.com/phpstan/phpstan/issues/4292 and PHPStorm will flag it as a possible bug: "'void' method result used".

This is not limited to a case where a match statement result is assigned. All these issues (PHPStorm, PHPStan) are present even if the match result is not used.

Test script:
---------------
<?php

function nothing(): void
{
 
}

$result = match ('inserted') {
    'inserted' => nothing(),
};

var_dump($result);

Expected result:
----------------
Either parse error on the branch or at least parse error in the assignment to `result` would make sense to me.

Actual result:
--------------
NULL