Description:
------------
in prior 5.1, it is allowed to do: 
class MyClass { 
public function __set($key, &$value) {} 
} 
$c = new MyClass(); 
$c->d=10; 

in 5.1 up: 
that code result this: 
Fatal error: Couldn't execute method MyClass::__set in Unknown on line 0 

I have submit this bug. My question is, is it possible to assign as reference using setter method ? 



Reproduce code:
---------------
class MyClass { 
public function __set($key, &$value) {} 
} 
$c = new MyClass(); 
$c->d=10;