case "H8":
			if isIndex {
				return errors.New("invalid register extension")
			}
			a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_8H & 15) << 5)
		case "S2":
			if isIndex {
				return errors.New("invalid register extension")
			}
			a.Reg = arm64.REG_ARNG + (reg & 31) + ((arm64.ARNG_2S & 15) << 5)
		case "S4":
			if isIndex {

array with the operand.
</p>

<pre>
var a [10]int
s1 := a[3:7]   // underlying array of s1 is array a; &amp;s1[2] == &amp;a[5]
s2 := s1[1:4]  // underlying array of s2 is underlying array of s1 which is array a; &amp;s2[1] == &amp;a[5]
s2[1] = 42     // s2[1] == s1[2] == a[5] == 42; they all refer to the same underlying array element

var s []int
s3 := s[:0]    // s3 == nil
</pre>