public static function __callStatic($name, $args)
{
if (!self::$instance) {
self::$instance = new D\ump();
}
return call_user_func_array([self::$instance, $name], $args);
}
<?php
class C
{
/** @return static */
static function instance()
{
return new static();
}
/** @return static */
function f()
{
return $this;
}
}
class D extends C
{
}
class E
{
}
function g(E $p)
{
}
g(D::instance()->f());
g(C::instance()->f());
