void	dump_stringvec(vector<string> &vs,int expect=-2)
void	dump_stringvec(std::vector<std::string> &vs,int expect=-2)
void	dump_stringvec(vector<string> &vs,int expect=-2){	size_t	n;	cout << "vs is " << vs.size() << " entries" << endl;	for(n=0;n<vs.size();n++)		cout << n << " : " << vs[n] << endl;	if(expect==-2)		return;	assert(vs.size()==expect);}