s.Scan()
	}
	// make sure there were no token-internal errors reported by scanner
	if s.ErrorCount != 0 {
		t.Errorf("%d errors", s.ErrorCount)
	}
}

func TestScanZeroMode(t *testing.T) {
	src := makeSource("%s\n")
	str := src.String()
	s := new(Scanner).Init(src)
	s.Mode = 0       // don't recognize any token classes
	s.Whitespace = 0 // don't skip any whitespace