title: Appending an integer to a List in Ocaml
body: <p>How can I implement this function the hard way without the <code>@</code> operator ?</p>
  
  <pre><code>let rec append l i =
  
      (* For example, if l is a list [1;2] and i is an integer 3
                append [1;2] 3 = [1;2;3]*)
  ;;
  </code></pre>