class a 
	{
	}
	
	class b
	{	
		protected function __construct($x)
		{
		}
	}
	
	class c extends b
	{
		protected function __construct(a $x)
		{
			$this->t($x);
		}
	}




// 

	class a 
	{
	}
	
	class b
	{
		static function t($x)
		{
			return new self($x);
		}
	}
	
	class c extends b
	{
		static function t(a $x)  // Declaration of c::t() should be compatible with b::t($x)
		{
			return new self($x);
		}
	}


//


	class a 
	{
	}
	
	class b
	{	
		protected function __construct($x)
		{
		}
	}
	
	class c extends b
	{
		public function __construct(a $x)
		{
		}
	}


//


	class a 
	{
	}
	
	class b
	{
		protected static function t($x)
		{
			return new self($x);
		}
	}
	
	class c extends b
	{
		public static function t($x)
		{
			return new self($x);
		}
	}