type DT struct {
	//	X OnTheFly
	A     int
	B     string
	C     float64
	I     any
	J     any
	I_nil any
	M     map[string]int
	T     [3]int
	S     []string
}

func newDT() DT {
	var dt DT
	dt.A = 17
	dt.B = "hello"
	dt.C = 3.14159
	dt.I = 271828
	dt.J = OnTheFly{3}
	dt.I_nil = nil
	dt.M = map[string]int{"one": 1, "two": 2}
	dt.T = [3]int{11, 22, 33}