}

// altGetRandom if non-nil specifies an OS-specific function to get
// urandom-style randomness.
var altGetRandom func([]byte) (err error)

func warnBlocked() {
	println("crypto/rand: blocked for 60 seconds waiting to read random data from the kernel")
}

func (r *reader) Read(b []byte) (n int, err error) {
	boring.Unreachable()
	if r.used.CompareAndSwap(0, 1) {