title: Haskell - Export data constructor
body: <p>I have this data on my Module Formula : </p>
  
  <pre><code>data Formula = Formula {
      typeFormula :: String, 
      nbClauses   :: Int,
      nbVars      :: Int,
      clauses     :: Clauses       
  }
  </code></pre>
  
  <p>And I want to export it but I don't know the right syntax : </p>
  
  <pre><code>module Formula (
      Formula ( Formula ),
      solve
  ) where
  </code></pre>
  
  <p>Someone can tell me the right syntax please ?</p>