// int32
	var i20 int32 = 0
	var i21 int32 = 1
	var i22 int32 = -1
	var i23 int32 = 2147483647
	var i24 int32 = -2147483647
	var i25 int32 = -2147483648
	var i26 int32 = +2147483647
	assert(i21 == i20+1, "i21")
	assert(i22 == -i21, "i22")
	assert(i23 == -i24, "i23")
	assert(-(i25+1) == i26, "i25")
	assert(i23 == (1<<31)-1, "i23 size")

	// int64
	var i30 int64 = 0
	var i31 int64 = 1
	var i32 int64 = -1

	// this is a case that the frontend failed to eliminate.
	p := &y
	*p = x // no barrier
	return
}

type T23 struct {
	p *int
	a int
}

var t23 T23
var i23 int

// f23x: zeroing global needs write barrier for the hybrid barrier.
func f23a() {
	t23 = T23{} // ERROR "write barrier"
}

func f23b() {
	// also test partial assignments