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: main.go
    path of file: ./repos/gccrs/libgo/go/cmd/test2json
    
    the code of the file until where you have to start completion: // Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test2json converts go test output to a machine-readable JSON stream.
//
// Usage:
//
//	go tool test2json [-p pkg] [-t] [./pkg.test -test.v [-test.paniconexit0]]
//
// Test2json runs the given test command and converts its output to JSON;
// with no command specified, test2json expects test output on standard input.
// It writes a corresponding stream of JSON events to standard output.
// There is no unnecessary inpu
    
func main() {
	flag.Usage = usage
	flag.Parse()

	var mode test2json.Mode
	if *flagT {
		mode |= test2json.Timestamp
	}
	c := test2json.NewConverter(os.Stdout, *flagP, mode)
	defer c.Close()

	if flag.NArg() == 0 {
		io.Copy(c, os.Stdin)
	} else {
		args := flag.Args()
		cmd := exec.Command(args[0], args[1:]...)
		w := &countWriter{0, c}
		cmd.Stdout = w
		cmd.Stderr = w
		err := cmd.Run()
		if err != nil {
			if w.n > 0 {
				// Assume command printed why it failed.
			} else {
				fmt.Fprintf(c, "test2json: %v\n", err)
			}
		}
		c.Exited(err)
		if err != nil {
			c.Close()
			os.Exit(1)
		}
	}
}