function foo(): void {
    $foo = new Foo();
    $foo->bar();
    $foo?->bar();
    $bar = $foo?->bar;
    $baz = $foo->bar?->baz;
    $a = $foo->a(...);
    $b = $foo::b(...);
    $c = $foo::c();
    $d = $foo->d;
    $e = $foo::$d;
    $f = $foo?->b?->c();
}