}

	for _, v := range vectors {
		ts, err := parsePAXTime(v.in)
		ok := (err == nil)
		if v.ok != ok {
			if v.ok {
				t.Errorf("parsePAXTime(%q): got parsing failure, want success", v.in)
			} else {
				t.Errorf("parsePAXTime(%q): got parsing success, want failure", v.in)
			}
		}
		if ok && !ts.Equal(v.want) {
			t.Errorf("parsePAXTime(%q): got (%ds %dns), want (%ds %dns)",

	octBits := uint(n-1) * 3
	return x >= 0 && (n >= 22 || x < 1<<octBits)
}

// parsePAXTime takes a string of the form %d.%d as described in the PAX
// specification. Note that this implementation allows for negative timestamps,
// which is allowed for by the PAX specification, but not always portable.
func parsePAXTime(s string) (time.Time, error) {
	const maxNanoSecondDigits = 9