[Bug c++/14387] New: syntax problem with casting operator and extra parenthesises

["serge dot bogdanov at intel dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The following code caused g++ syntax error. All strings in the 'main' are
functionally the same. The second one differs from the first only by parens
added around the rh expression. The last one differs in the way a casting
operator is expressed. 1 and 3 lines are OK. The second gives the following:

>> gcc/3.3.2/bin/g++ -c -I$sclasssrc -I$common/include e.cxx
e.cxx: In function `int main()':
e.cxx:16: error: parse error before `<<' token

Here is the code:

template <int MSB, int LSB>
struct	Data {
    Data();
    operator unsigned ();
};

template<int EXTMSB, int EXTLSB>
struct Funct : public Data<EXTMSB - EXTLSB, 0> {
    template<int MSB, int LSB>
    Funct(const Data<MSB,LSB> &src); 
};

Data<88,0>	abc;
int main() {
    unsigned x;
    //x = unsigned(Funct<20,20>(abc)) << 1;	   // works
    x = (unsigned(Funct<20,20>(abc)) << 1);	   // does not work
    // x = ((unsigned)Funct<20,20>(abc) << 1) ;	   // works
    return 0;
}

It produces the same error in 3.2.2

-- 
           Summary: syntax problem with casting operator and extra
                    parenthesises
           Product: gcc
           Version: 3.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: serge dot bogdanov at intel dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14387