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POHaskell Error "Not in scope: data constructor"
 

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    <p>I've reviewed the other posts on this error, and I don't think I'm making any of those mistakes.</p> <p>Not in scope: data constructor 'Extraction'.</p> <p>Configuration.hs:</p> <pre><code>module Configuration (Config , columns , headers , types , totals , extractions, Extraction , xState , xDivisions , xOffice ...) where ... data Extraction = Extraction { xState :: String , xDivisions :: Maybe [String] , xOffice :: Maybe String } deriving Show data Config = Config { columns :: String , headers :: [String] , types :: [String] , totals :: [String] , extractions :: [Extraction] } deriving Show ... </code></pre> <p>PIF.hs:</p> <pre><code>module PIF (...) where import Configuration ... data Report = Report { division :: String , state :: String , office :: String , inSection :: Bool , content :: [String] } deriving Show ... extract :: Config -&gt; [Report] -&gt; [Report] extract c = filter f where f Report { division=d, state=s, office=o, inSection=_, content=_ } = map or $ map isMatch $ extractions c where isMatch | Extraction { xState=xS, xDivisions=Just xD, xOffice=Nothing } = s==xS &amp;&amp; (map or $ map (==d) xD) | Extraction { xState=xS, xDivisions=Nothing, xOffice=Just xO } = s==xS &amp;&amp; o==xO </code></pre> <p>Let me know if you need more information. Thanks.</p> <p>Here is my corrected <code>extract</code>:</p> <pre><code>extract c = filter f where f Report { division=d, state=s, office=o, inSection=_, content=_ } = or $ map isMatch $ extractions c where isMatch x = case ((xDivisions x), (xOffice x)) of (Nothing, Just y) -&gt; s==(xState x) &amp;&amp; o==y (Just y, Nothing) -&gt; s==(xState x) &amp;&amp; (or $ map (==d) y) </code></pre>
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    1. COThis error also covered the fact that I was using pattern syntax in an expression context. I changed the `Extraction {xState=xS...}` to a `case` statement. I also removed the incorrect `map`s over `or`. `or` reduces a list, it doesn't map over it.
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