You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lag.go
    path of file: ./repos/plumber/backends/kafka
    
    the code of the file until where you have to start completion: package kafka

import (
	"context"
	"encoding/json"
	"fmt"
	"time"
    
func validateReadArgsForLag(readArgs *args.KafkaReadArgs) error {
	if err := validateReadArgs(readArgs); err != nil {
		return errors.Wrap(err, "unable to complete base read args validation")
	}

	if readArgs.Lag && readArgs.LagConsumerGroup == "" {
		return errors.New("must include lag consumer group if --lag is specified")
	}

	return nil
}