title: Is there a way to add an empty element to a list in OCaml?
body: <p>Consider a given list <code>[3;4;5]</code>.<br>
  Now, I want to execute <code>x::[3;4;5];;</code><br>
  Is there an <code>x</code> in OCaml which leads to the result <code>[3;4;5]</code> again?</p>