slice

import pry.atoms, pry.stream, std.conv;
alias S = SimpleStream!string;
with(parsers!S){
	auto p = seq(tk!'-'.optional, range!('0', '9').rep)
					.slice
					.map!(x => to!int(x));
	auto s = "-13".stream;
	int value;
	S.Error err;
	assert(p.parse(s, value, err));
	assert(value == -13);
	s = "5".stream;
	assert(p.parse(s, value, err));
	assert(value == 5);
}