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: parse.go
    path of file: ./repos/gallium/vendor/github.com/alexflint/go-arg
    
    the code of the file until where you have to start completion: package arg

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"strings"
)

// spec represents a command line option
type spec struct {
	dest       reflect.Value
	long       string
	short      string
	multiple   bool
	required   bool
	positional bool
	help  
    
func (p *Parser) Parse(args []string) error {
	// If -h or --help were specified then print usage
	for _, arg := range args {
		if arg == "-h" || arg == "--help" {
			return ErrHelp
		}
		if arg == "--version" {
			return ErrVersion
		}
		if arg == "--" {
			break
		}
	}

	// Process all command line arguments
	err := process(p.spec, args)
	if err != nil {
		return err
	}

	// Validate
	return validate(p.spec)
}