Trying to write a singleton interface:

interface Singleton {
    // Disallow public construction
    protected function __construct();

    public static function getInstance();
}

I got an error saying I was not allowed to declare the constructor 
protected - I should either use public or omit it.

Why can't I instruct Singleton-classes to use protected constructors? 
Is this expected behavior or may I file a bug report?

-- 
Ferdinand Beyer
<[EMAIL PROTECTED]>

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