title: Can't get Data.List functions to work in haskell
body: <p>I'm building a haskell program, and I want to use the library Data.List. So at the top of my program I've added<code>import Data.List</code> and below in one of my functions I've typed <code>Data.List.isAlpha x</code> but it gives me a compile error - <code>Not in scope:</code>Data.List.isAlpha'`. Any suggestions? I've tried using another function from Data.List and that doesn't work.</p>
  
  <p>Here's the function, but I've tried dumbing it down but its not working either:</p>
  
  <p><code>myFunc:: [String] -&gt; String</code></p>
  
  <p><code>myFunc list =  filter Data.List.isAlpha (Data.List.nub(concat list))</code></p>
  
  <p>This function is taking a list of strings, nub'ing then to get rid of duplicates, and then keeping only the characters left that are letters.</p>
  
  <p>Any help would be really useful! Thanks!</p>