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: go.go
    path of file: ./repos/gop/cmd/internal/gengo
    
    the code of the file until where you have to start completion: /*
 * Copyright (c) 2021-2021 The GoPlus Authors (goplus.org). All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Package gengo implements the “gop go” command.
package gengo

import (
	"fmt"
	"log"
	"os"
	"reflect"

	"github.com/goplus/gogen"
	"github.com/goplus/gop"
	"github.com/goplus/gop/cl"
	"github.com/goplus/gop/cmd/internal/base"
	"github.com/goplus/gop/x/gopprojs"
	"github.com/qiniu/x/errors"
)

// gop go
var Cmd = &base.Command{
	UsageLine: "gop go [-v] [packages|files]",
	Short:     "Convert Go+ code into Go code",
}

var (
	flag                 = &Cmd.Flag
	flagVerbose          = flag.Bool("v", false, "print verbose information")
	flagCheckMode        = fla
    
func runCmd(cmd *base.Command, args []string) {
	err := flag.Parse(args)
	if err != nil {
		log.Panicln("parse input arguments failed:", err)
	}
	pattern := flag.Args()
	if len(pattern) == 0 {
		pattern = []string{"."}
	}

	projs, err := gopprojs.ParseAll(pattern...)
	if err != nil {
		log.Panicln("gopprojs.ParseAll:", err)
	}

	if *flagVerbose {
		gogen.SetDebug(gogen.DbgFlagAll &^ gogen.DbgFlagComments)
		cl.SetDebug(cl.DbgFlagAll)
		cl.SetDisableRecover(true)
	}

	conf, err := gop.NewDefaultConf(".", false)
	if err != nil {
		log.Panicln("gop.NewDefaultConf:", err)
	}

	flags := gop.GenFlagPrintError | gop.GenFlagPrompt
	if *flagCheckMode {
		flags |= gop.GenFlagCheckOnly
		if *flagIgnoreNotatedErr {
			conf.IgnoreNotatedError = true
		}
	}
	if *flagSingleMode {
		flags |= gop.GenFlagSingleFile
	}
	for _, proj := range projs {
		switch v := proj.(type) {
		case *gopprojs.DirProj:
			_, _, err = gop.GenGoEx(v.Dir, conf, true, flags)
		case *gopprojs.PkgPathProj:
			_, _, err = gop.GenGoPkgPathEx("", v.Path, conf, true, flags)
		case *gopprojs.FilesProj:
			_, err = gop.GenGoFiles("", v.Files, conf)
		default:
			log.Panicln("`gop go` doesn't support", reflect.TypeOf(v))
		}
		if err != nil {
			fmt.Fprintf(os.Stderr, "GenGo failed: %d errors.\n", errorNum(err))
			os.Exit(1)
		}
	}
}