Meaning of underscore in a Go function parameter
<p>Came accross the below function <a href="https://godoc.org/github.com/julienschmidt/httprouter">here</a>. I noticed the last parameter is identified with <code>_</code>. What is the intent of this pattern?</p>

<pre><code>func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    fmt.Fprint(w, "Welcome!\n")
}
</code></pre>