Description:
------------
The magic invoke function fails to trigger if an object belongs to another object.

Test script:
---------------
class A {
	public function __invoke() {
		echo 'hello from A ';
	}
}

class B {
	protected $a;	
	public function __invoke() {
		echo 'hello from B ';
		$this->a = new A();
		$this->a();
	}
}

$b = new B();
$b();

Expected result:
----------------
hello from B hello from A

Actual result:
--------------
hello from B
Fatal error: Call to undefined method B::a() in C:\xampp\gazelle\tools\htdocs\testing.php on line 15