2.0.4 Allow variable list on one line for multiline closures

[sjokki]

https://www.php-fig.org/psr/psr-2/#6-closures explicitly shows that the
following is allowed:

$longArgs_shortVars = function (
    $longArgument,
    $longerArgument,
    $muchLongerArgument
) use ($var1) {
    // body
};