Gordons RFC
===========

//initial code

class A {
 	private $f;
  	function __construct($this->f) {
  	}
}

class B extends A {
  function __construct($this->f) {
        //Sets $f and also calls constructor
  		parent::__construct($f);
  }
}


//Constructor of A is changed - only need to change how constructor is called, everything else still works

class A {
 	private $f;
  	function __construct() {
  	}
}

class B extends A {
  function __construct($this->f) {
  		parent::__construct();
  }
}



Facebook RFC
============

//Initial code

class A {
 	private $f;
  	function __construct(private $f) {
  		$this->f = $f;
  	}
}

class B extends A {
  //can't declare parameters as 'private $f' as it will created duplicate variable in class B
  function __construct($f) {
  		parent::__construct($f);
  }
}



//Constructor of A is changed - now need to change how constructor of B is defined, as well as how it calls A::__construct
class A {
 	private $f;
  	function __construct() {
  	}
}

class B extends A {
  function __construct(private $f) {
  		//Creates $f on B - does not set it on A. We are fubared.
  		parent::__construct();
  }
}