* pointer, if sequence is unchanged. */
epvector * mul::expandchildren(unsigned options) const
{
- epvector::const_iterator last = seq.end();
+ const epvector::const_iterator last = seq.end();
epvector::const_iterator cit = seq.begin();
while (cit!=last) {
const ex & factor = recombine_pair_to_ex(*cit);