title: Ocaml error unbound Value
body: <p>When i try to evaluate line 2 or 5 of this program, i get "Unbound value carre" or  "Unbound value bis". 
  To evaluate it i use emacs with tuareg, could it be related ?</p>
  
  <pre><code>let carre x = x*x;;
  carre(9);;
  
  let bis y = y^y;;
  bis("ab");;
  </code></pre>
  
  <p>For example, here is what i get for line 2 :</p>
  
  <pre><code># Characters 0-5:
    carre(9);;
    ^^^^^
  Error: Unbound value carre
  # 
  </code></pre>
  
  <p>The code is very simple so i feel like the problem comes from emacs.
  I've tried to change function names, variables names, but nothing worked.
  Does anybody see what's wrong here ?</p>