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