return t, false
		}
		return join(t1, t2), true
	}
}

type Pair[A, B any] struct {
	A A
	B B
}

func _NewPair[A, B any](a A, b B) Pair[A, B] {
	return Pair[A, B]{a, b}
}

func Combine2[A, B any](ga Gen[A], gb Gen[B]) Gen[Pair[A, B]] {
	return Combine(ga, gb, _NewPair[A, B])
}

func main() {
	var g1 Gen[int] = func() (int, bool) { return 3, true }