// 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