func math/rand.NewSource

3 uses

	math/rand (current package)
		rand.go#L51: func NewSource(seed int64) Source {

	math/big
		prime.go#L95: 	rand := rand.New(rand.NewSource(int64(n[0])))

	github.com/refraction-networking/utls
		u_parrots.go#L2725: 		rand.New(rand.NewSource(randInt64.Int64())).Shuffle(len(exts), func(i, j int) {