const time.stdMask

5 uses

	time (current package)
		format.go#L133: 	stdMask      = 1<format.go#L545: 		switch std & stdMask {
		format.go#L672: 			b = formatNano(b, uint(t.Nanosecond()), std>>stdArgShift, std&stdMask == stdFracSecond9)
		format.go#L865: 		switch std & stdMask {
		format.go#L945: 				std &= stdMask