nsSubsumeStr& operator=( const nsSubsumeStr& aReadable )                        { Assign(aReadable); return *this; }
nsString& operator=( const nsPromiseReadable<PRUnichar>& aReadable )        { Assign(aReadable); return *this; }
  nsSubsumeStr& operator=( const nsSubsumeStr& aReadable )                        { Assign(aReadable); return *this; }