nsCString& operator=( const nsPromiseReadable<char>& aReadable )  { Assign(aReadable); return *this; }
nsCAutoString& operator=( const nsPromiseReadable<char>& aReadable )  { Assign(aReadable); return *this; }
  nsCString& operator=( const nsPromiseReadable<char>& aReadable )  { Assign(aReadable); return *this; }