title: Parse error in where
body: <p>In this code </p>
  
  <pre><code>neighbours :: CityMap -&gt; District -&gt; [District]
  neighbours (CM (_,rs)) b = mapMaybe neighbour rs
      where neighbour (p,q)
          | b == p    = Just q --parse error (possibly incorrect indentation or mismatched brackets)
          | b == q    = Just p
          | otherwise = Nothing
  </code></pre>
  
  <p>i have parse in first «|»</p>