class constants bugs

1. This code:
   <?
   class Priority {
   const DEBUG = 0;
   const INFO = 1;
   const WARN = 2;
   const ERROR = 3;
   const FATAL = 4;

    const MAX_PRIORITY = FATAL;
   

}

class ExtendedPriority extends Priority {
const REMOTE = Priority::MAX_PRIORITY + 1;
const URGENT = parent::MAX_PRIORITY + 2;
}
?>

results in this error:

PHP Fatal error: Unsupported operand types in /test.php on line 13

Shouldn't class constants support simple expressions ?

2. Also, this code:
   <?
   class test {
   const TEST = "hi";
   const TEST1 = self::TEST . "ih";
   }
   ?>
   Results in segmentation fault.

Cristiano Duarte