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: variant.go
    path of file: ./repos/teller/vendor/github.com/godbus/dbus/v5
    
    the code of the file until where you have to start completion: package dbus

import (
	"bytes"
	"fmt"
	"reflect"
	"sort"
	"strconv"
)

// Variant represents the D-Bus variant type.
type Variant struct {
	sig   Signature
	value interface{}
}

// MakeVariant converts the given value to a Variant
    
func ParseVariant(s string, sig Signature) (Variant, error) {
	tokens := varLex(s)
	p := &varParser{tokens: tokens}
	n, err := varMakeNode(p)
	if err != nil {
		return Variant{}, err
	}
	if sig.str == "" {
		sig, err = varInfer(n)
		if err != nil {
			return Variant{}, err
		}
	}
	v, err := n.Value(sig)
	if err != nil {
		return Variant{}, err
	}
	return MakeVariant(v), nil
}