function foo(): void {
    a;

    $a;

    $a::b;

    $a->b;

    $a::b();
    $a::b($a);
    $a::b(...);
    $a::b(...$a);

    $a->b();
    $a->b($a);
    $a->b(...);
    $a->b(...$a);

    $a?->b();
    $a?->b($a);
    $a?->b(...$a);

    $a::b::<int>();
    $a::b::<int>($a);
    $a::b::<int>(...);
    $a::b::<int>(...$a);

    $a->b::<int>();
    $a->b::<int>($a);
    $a->b::<int>(...);
    $a->b::<int>(...$a);

    $a?->b::<int>();
    $a?->b::<int>($a);
    $a?->b::<int>(...$a);

    a();
    a($a);
    a(...);
    a(...$a);

    a::<int>();
    a::<int>($a);
    a::<int>(...);
    a::<int>(...$a);

    new Foo();
    new Foo($a);

    new Foo::<int>($a);
    new Foo::<int>(...$a);

    new Foo::<int, string>($a);
    new Foo::<int, string>(...$a);

    $c = $a | $b;
    $c = $a & $b;
    $c = $a ^ $b;
    $c = $a << $b;
    $c = $a >> $b;

    $c = $a ** $b;
    $c = $a + $b;
    $c = $a - $b;
    $c = $a * $b;
    $c = $a / $b;
    $c = $a % $b;
    $c = $a . $b;

    $c = $a ?? $b;

    $c = $a && $b;
    $c = $a || $b;

    $c = $a == $b;
    $c = $a === $b;
    $c = $a != $b;
    $c = $a !== $b;
    $c = $a <= $b;
    $c = $a >= $b;
    $c = $a < $b;
    $c = $a > $b;

    $c = $a <=> $b;

    $a ??= $b;
    $a += $b;
    $a -= $b;
    $a *= $b;
    $a /= $b;
    $a %= $b;
    $a .= $b;
    $a &= $b;
    $a |= $b;
    $a ^= $b;
    $a <<= $b;
    $a >>= $b;
    $a **= $b;

    $a++;
    $a--;
    ++$a;
    --$a;

    $a = !$b;
    $a = ~$b;
    $a = +$b;
    $a = -$b;

    $a = vec[];
    $a = vec[$a, $b];
    $a = vec[$a, $b,];

    $a = dict[];
    $a = dict[$a => $b, $a => $b];
    $a = dict[$a => $b, $a => $b,];

    $a = $a[$b];

    $a = $a[$b] ?? $c;

    $a[$b] = $c;
    $a[$b] ??= $c;
}