const crypto/tls.alertProtocolVersion

7 uses

	crypto/tls (current package)
		alert.go#L46: 	alertProtocolVersion              alert = 70
		alert.go#L82: 	alertProtocolVersion:              "protocol version not supported",
		conn.go#L645: 		c.sendAlert(alertProtocolVersion)
		conn.go#L658: 		c.sendAlert(alertProtocolVersion)
		handshake_client.go#L425: 		c.sendAlert(alertProtocolVersion)
		handshake_client_tls13.go#L51: 		c.sendAlert(alertProtocolVersion)
		handshake_server.go#L164: 		c.sendAlert(alertProtocolVersion)