var i31 int64 = 1
	var i32 int64 = -1
	var i33 int64 = 9223372036854775807
	var i34 int64 = -9223372036854775807
	var i35 int64 = -9223372036854775808
	var i36 int64 = +9223372036854775807
	assert(i31 == i30+1, "i31")
	assert(i32 == -i31, "i32")
	assert(i33 == -i34, "i33")
	assert(-(i35+1) == i36, "i35")
	assert(i33 == (1<<63)-1, "i33 size")

	// uint8
	var u00 uint8 = 0
	var u01 uint8 = 1
	var u02 uint8 = 255