<?php

class Foo extends Bar {
  public static function newInstance() {
    return new Foo();
  }

  public static function init() {
    return new self();
  }
}
~~~~~~~~~~
warning:5:16
~~~~~~~~~~
<?php

class Foo extends Bar {
  public static function newInstance() {
    return new self();
  }

  public static function init() {
    return new self();
  }
}