pkg syscall (freebsd-arm), func SendmsgN(int, []uint8, []uint8, Sockaddr, int) (int, error)
pkg syscall (freebsd-arm), type BpfHdr struct, Pad_cgo_0 [6]uint8
pkg syscall (freebsd-arm), type Flock_t struct, Pad_cgo_0 [4]uint8
pkg syscall (freebsd-arm), type IfData struct, Pad_cgo_0 [4]uint8
pkg syscall (freebsd-arm), type Termios struct
pkg syscall (freebsd-arm), type Termios struct, Cc [20]uint8

and -1 for signed and untyped constants.
</p>

<pre>
^1         // untyped integer constant, equal to -2
uint8(^1)  // illegal: same as uint8(-2), -2 cannot be represented as a uint8
^uint8(1)  // typed uint8 constant, same as 0xFF ^ uint8(1) = uint8(0xFE)
int8(^1)   // same as int8(-2)
^int8(1)   // same as -1 ^ int8(1) = -2
</pre>

<p>
Implementation restriction: A compiler may use rounding while

func (z *DeleteOptions) EncodeMsg(en *msgp.Writer) (err error) {
	// check for omitted fields
	zb0001Len := uint32(5)
	var zb0001Mask uint8 /* 5 bits */
	_ = zb0001Mask
	if z.OldDataDir == "" {
		zb0001Len--
		zb0001Mask |= 0x10
	}
	// variable map header, size zb0001Len
	err = en.Append(0x80 | uint8(zb0001Len))
	if err != nil {
		return
	}
	if zb0001Len == 0 {
		return
	}
	// write "BaseOptions"