Description:
------------
Its possible to create an instance of an interface
PHP Version: 5.0.0RC3RC2

Reproduce code:
---------------
php5-1.php:
<?php
	
	class foo {
		public $member = 'value';
	}
	session_start( );
	$_SESSION['foo'] = new foo;
	
?>
<a href="php5-2.php">next</a>


php5-2.php:
<?php
	
	interface foo {
	}
	function __autoload( $name ) {
		var_dump( '__autoload(): '.$name );
	}
	
	session_start( );
	var_dump( $_SESSION );
	
?>

Expected result:
----------------
the following should occur:
- call __autoload()
- if class foo isnt available: display error: Cannot instantiate interface foo at sesstion_start() or something


Actual result:
--------------
array(1) {
  ["foo"]=>
  object(foo)#1 (1) {
    ["member"]=>
    string(5) "value"
  }
}