var x struct {
		before int32
		i      int32
		after  int32
	}
	x.before = magic32
	x.after = magic32
	var j int32
	for mask := int32(1); mask != 0; mask <<= 1 {
		old := x.i
		k := OrInt32(&x.i, mask)
		j |= mask
		if x.i != j || k != old {
			t.Fatalf("mask=%d i=%d j=%d k=%d old=%d", mask, x.i, j, k, old)
		}
	}
	if x.before != magic32 || x.after != magic32 {