Rule::LookupSymbol(const nsString& aSymbol) const
Rule::LookupSymbol(const nsAReadableString& aSymbol) const
Rule::LookupSymbol(const nsString& aSymbol) const{    for (PRInt32 i = 0; i < mCount; ++i) {        if (aSymbol == mSymbols[i].mSymbol)            return mSymbols[i].mVariable;    }    return 0;}