b.WriteRune(' ')
		}
		b.WriteString(sprintKey(m.Key))
		b.WriteRune(':')
		fmt.Fprint(b, m.Value)
	}
	return b.String()
}

// sprintKey formats a reflect.Value but gives reproducible values for some
// problematic types such as pointers. Note that it only does special handling
// for the troublesome types used in the test cases; it is not a general
// printer.
func sprintKey(key reflect.Value) string {