}
		if got := pos.Col(); got != test.col {
			t.Errorf("%s: got col %d; want %d", test.string, got, test.col)
		}

		// relative info
		if got := pos.RelFilename(); got != test.relFilename {
			t.Errorf("%s: got relFilename %q; want %q", test.string, got, test.relFilename)
		}
		if got := pos.RelLine(); got != test.relLine {
			t.Errorf("%s: got relLine %d; want %d", test.string, got, test.relLine)
		}

//	r >  0: p is after q
//
// If p and q are in different files, p is before q if the filename
// of p sorts lexicographically before the filename of q.
func (p Pos) Cmp(q Pos) int {
	pname := p.RelFilename()
	qname := q.RelFilename()
	switch {
	case pname < qname:
		return -1
	case pname > qname:
		return +1
	}

	pline := p.Line()
	qline := q.Line()
	switch {
	case pline < qline:
		return -1