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: client.go
    path of file: ./repos/minicron/client/vendor/golang.org/x/crypto/ssh/agent
    
    the code of the file until where you have to start completion: // Copyright 2012 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.

// Package agent implements the ssh-agent protocol, and provides both
// a client and a server. The client can talk to a standard ssh-agent
// that uses UNIX sockets, and one could imp
    
func parseKey(in []byte) (out *Key, rest []byte, err error) {
	var record struct {
		Blob    []byte
		Comment string
		Rest    []byte `ssh:"rest"`
	}

	if err := ssh.Unmarshal(in, &record); err != nil {
		return nil, nil, err
	}

	var wk wireKey
	if err := ssh.Unmarshal(record.Blob, &wk); err != nil {
		return nil, nil, err
	}

	return &Key{
		Format:  wk.Format,
		Blob:    record.Blob,
		Comment: record.Comment,
	}, record.Rest, nil
}