[GiNaC-list] problem about collect_common_factors

[Feng Feng]

Hi all,

I got a strange problem about collect_common_factors,
the problem can be reproduced by the following example:
------
symbol a("a"),b("b"),c("c");
symtab table;
table["a"] = a;
table["b"] = b;
table["c"] = c;
parser reader(table);
ex res = reader("b*((c+c*(1+4*a+2*b+b^2)-c*(1+2*b+b^2)-(1+4*a)*c))-a*(c+c*(1+4*a+2*b+b^2)-c*(1+2*b+b^2)-(1+4*a)*c)");

cout << res << endl;
cout << collect_common_factors(res) << endl;
------
the collect_common_factors will throw an error: division by zero.
so is this a bug for collect_common_factors?

Best regards!
Feng
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