}

		var pid32 int32
		if pid == math.MaxUint64 {
			pid32 = -1
		} else {
			pid32 = int32(pid)
		}

		v, err := p.readVal()
		if err != nil {
			return err
		}

		*ev = rawEvent{
			typ:         EvBatch,
			args:        p.args[:0],
			batchPid:    pid32,
			batchOffset: off,
		}
		ev.args = append(ev.args, pid, v)

		ch <- true
	}()
	a = [5]int{1, 2, 3, 4, 5}
	<-ch
}

// Blows up a naive compiler.
func TestRaceNestedArrayCopy(t *testing.T) {
	ch := make(chan bool, 1)
	type (
		Point32   [2][2][2][2][2]Point
		Point1024 [2][2][2][2][2]Point32
		Point32k  [2][2][2][2][2]Point1024
		Point1M   [2][2][2][2][2]Point32k
	)
	var a, b Point1M
	go func() {
		a[0][1][0][1][0][1][0][1][0][1][0][1][0][1][0][1][0][1][0][1].y = 1

	bit1, mask1                           // bit1 == 2, mask1 == 1  (iota == 1)
	_, _                                  //                        (iota == 2, unused)
	bit3, mask3                           // bit3 == 8, mask3 == 7  (iota == 3)
)
</pre>

<p>
This last example exploits the <a href="#Constant_declarations">implicit repetition</a>
of the last non-empty expression list.
</p>

	bit1, mask1                           // bit1 == 2, mask1 == 1  (iota == 1)
	_, _                                  //                        (iota == 2, unused)
	bit3, mask3                           // bit3 == 8, mask3 == 7  (iota == 3)
)
</pre>

<p>
This last example exploits the <a href="#Constant_declarations">implicit repetition</a>
of the last non-empty expression list.
</p>