const crypto/tls.alertProtocolVersion

7 uses

	crypto/tls (current package)
		alert.go#L36: 	alertProtocolVersion              alert = 70
		alert.go#L72: 	alertProtocolVersion:              "protocol version not supported",
		conn.go#L633: 		c.sendAlert(alertProtocolVersion)
		conn.go#L640: 		c.sendAlert(alertProtocolVersion)
		handshake_client.go#L367: 		c.sendAlert(alertProtocolVersion)
		handshake_client_tls13.go#L47: 		c.sendAlert(alertProtocolVersion)
		handshake_server.go#L161: 		c.sendAlert(alertProtocolVersion)