No option to throw an error inside map about brightfutures HOT 9 CLOSED

return client.call(method: method, params: json).flatMap { (json:JSON) -> Result<JSON> in
                var result: Result<JSON, Error>
                
                do {
                    let response = try self.decoder.decode(responseType, from: json.rawData())
                    DDLogDebug("call process \(json)")
                    result = response
                }
                catch let error {
                    DDLogError("Parse \(method) response failed: \(json) with error \(error.localizedDescription)")
                    result = error
                }
                
                return result
            }

return client.call(method: method, params: json).flatMap { (json:JSON) -> Result<JSON, Error> in
                var result: Result<JSON, Error>
                
                do {
                    let response = try self.decoder.decode(responseType, from: json.rawData())
                    DDLogDebug("call process \(json)")
                    result = .success(response)
                }
                catch let error {
                    DDLogError("Parse \(method) response failed: \(json) with error \(error.localizedDescription)")
                    result = .failure(response)
                }
                
                return result
            }

return client.call(method: method, params: json).flatMap { (json:JSON) -> Swift.Result<T, Error> in
                var result: Swift.Result<T, Error>
                
                do {
                    let response = try self.decoder.decode(responseType, from: json.rawData())
                    DDLogDebug("call process \(json)")
                    result = .success(response)
                }
                catch let error {
                    DDLogError("Parse \(method) response failed: \(json) with error \(error.localizedDescription)")
                    result = .failure(error)
                }
                
                return result
            }