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POhaskell model export error
 

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  1. POhaskell model export error
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    <p>Reference <a href="https://stackoverflow.com/questions/11596234/haskell-facebook-example">haskell facebook example</a> works perfect, but now I can't figure out how to split it in a separate module so I can do something useful with it. Also I can't figure out what type I need to put for fbEmail fbUrl and if I need to put OverloadedStrings in every module? Maybe my thinking process is wrong and its simple not possible to separate the import Network.HTTP.Conduit (withManager) from main?</p> <p>login.hs</p> <pre><code>{-# LANGUAGE OverloadedStrings, NoMonomorphismRestriction #-} module Login ( fbUrl, fbEmail ) where import qualified Facebook as FB import Network.HTTP.Conduit (withManager) import Data.Text import Data.ByteString.Internal (ByteString) app :: FB.Credentials app = FB.Credentials "localhost" "249348058430770" "..." url :: FB.RedirectUrl url = "http://localhost/fb" perms :: [FB.Permission] perms = ["user_about_me", "email"] fbUrl = FB.getUserAccessTokenStep1 url perms fbEmail c = withManager $ \manager -&gt; FB.runFacebookT app manager $ do t &lt;- FB.getUserAccessTokenStep2 url [c] u &lt;- FB.getUser "me" [] (Just t) return $ FB.userEmail u </code></pre> <p>main.hs</p> <pre><code>module Main ( main ) where import Login import System.IO main :: IO () main = do u &lt;- fbUrl print u a &lt;- readLn e &lt;- fbEmail a print e </code></pre> <p>I get the following error </p> <pre><code>src/Main.hs:11:10: Couldn't match expected type `IO t0' with actual type `fb-0.9.6:Facebook.Monad.FacebookT fb-0.9.6:Facebook.Monad.Auth m0 Data.Text.Internal.Text' In a stmt of a 'do' block: u &lt;- fbUrl In the expression: do { u &lt;- fbUrl; print u; a &lt;- readLn; e &lt;- fbEmail a; .... } In an equation for `main': main = do { u &lt;- fbUrl; print u; a &lt;- readLn; .... } </code></pre> <p>CODE UPDATE 6: see answer</p>
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    1. USCommunity
    1. USGert Cuykens
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    1. COYou need the overloaded strings extension only in those files where you want to treat syntactic strings (things enclosed in `"`) as non-`String` types (such as `Text`).
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      1. USTilo Wiklund
    2. COok so I can drop OverloadedStrings in main? return seem to to fix `FB.userEmail u` but now i get the following see update.
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      1. USGert Cuykens
    3. CO`fbUrl :: Monad m => FB.FacebookT FB.Auth m (Maybe Text)` Not in scope: type constructor or class Text
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      1. USGert Cuykens
 

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