Fails with "embed" package about httprouter HOT 1 CLOSED

//go:embed static
var content embed.FS

mux := httprouter.New()

if static, err := fs.Sub(content, "static"); err == nil {
    mux.Handler("GET", "/static/*path", http.StripPrefix("/static", http.FileServer(http.FS(static))))
} else {
    panic(err)
}

http.ListenAndServe(":8080", mux)