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: site_embed.go
    path of file: ./repos/coder/site
    
    the code of the file until where you have to start completion: //go:build embed
// +build embed

package site

import (
	"embed"
	"io/fs"
)

//go:embed a
    
func FS() fs.FS {
	// the out directory is where FE builds are created. It is in the same
	// directory as this file (package site).
	out, err := fs.Sub(site, "out")
	if err != nil {
		// This can't happen... Go would throw a compilation error.
		panic(err)
	}
	return out
}