var crypto/tls.tls10server

4 uses

	crypto/tls (current package)
		common.go#L1136: var tls10server = godebug.New("tls10server")
		common.go#L1145: 			if isClient || tls10server.Value() != "1" {
		handshake_server.go#L197: 		tls10server.Value() // ensure godebug is initialized
		handshake_server.go#L198: 		tls10server.IncNonDefault()