<?php

class Foo extends Bar {
  public static function doSomething() {
    return SELF::doSomethingElse();
  }

  public static function doSomethingElse() {
    return self::doSomething();
  }
}
~~~~~~~~~~
warning:5:12
~~~~~~~~~~
<?php

class Foo extends Bar {
  public static function doSomething() {
    return self::doSomethingElse();
  }

  public static function doSomethingElse() {
    return self::doSomething();
  }
}