Type Inference

The function below doubles a price or a weight. Which of the five uses in main compile, given that none of them writes a type argument?

func Double[T ~int64 | ~float64](v T) T { return v * 2 }

func main() {
	var price int64 = 2500

	_ = Double(price)
	_ = Double(1.5)
	_ = Double(3)
	var f = Double
	var g func(int64) int64 = Double
	_, _ = f, g
}
Copy

./main.go:10:12: int does not satisfy ~int64 | ~float64 (int missing in ~int64 | ~float64)
./main.go:11:10: cannot use generic function Double without instantiation
Copy