PRUint32 oldLength = Length();
PRUint32 oldLength = this->Length();
basic_nsAWritableString<CharT>::do_AppendFromElement( CharT aChar )  {    PRUint32 oldLength = Length();    SetLength(oldLength+1);    nsWritableFragment<CharT> fragment;    *GetWritableFragment(fragment, kFragmentAt, oldLength) = aChar;  }