}
	t1.End()

	// Create a task that starts during the trace and ends after.
	ctx2, t2 := trace.NewTask(ctx0, "type2")

	// Create a task that starts and ends during the trace.
	ctx3, t3 := trace.NewTask(baseCtx, "type3")

	// Generate some events.
	for i := 0; i < 2; i++ {
		do(baseCtx, 4)
		do(ctx0, 2)
		do(ctx1, 3)
		do(ctx2, 6)
		do(ctx3, 5)
	}