title: parse error on input `in' Haskell
body: <p>I would like to type Haskell source file this code from ghci</p>
  
  <pre><code>ghci&gt; let x = 3; y = "!" in show x ++ y  
  </code></pre>
  
  <p>and transform my code to this</p>
  
  <pre><code>x = 3
  y = "!" in show x ++ y 
  </code></pre>
  
  <p>but got an error message like</p>
  
  <blockquote>
    <p>parse error on input `in'</p>
  </blockquote>
  
  <p>How can I avoid the error and fix my code?</p>