[E037] Error: property `Foo::$s` cannot have type `string|int|callable` ,-[code.php:4:12] | 3 | class Foo { * ^^^ * 4 | public string|int|callable $s; * ^^^^^^^^^|^^^^^^^^^ ^^ * | * | * `-------------- try using a different type * * Note: `void`, `never`, and `callable` types are not allowed in properties ---'