[Haskell-beginners] help with type error in a wxHaskell program

Kim-Ee Yeoh ky3 at atamo.com
Sun Nov 22 03:52:13 UTC 2015


On Sat, Nov 21, 2015 at 8:28 PM, Jason J. Corso <jjcorso at eecs.umich.edu>
wrote:

> But, I get a type error that I do not understand
>
>     Couldn't match expected type ‘IO (Window a0)’
>                 with actual type ‘[Prop (Frame ())] -> IO (Frame ())’
>     Probable cause: ‘frame’ is applied to too few arguments
>

This is a consequence of the line "f <- frame" in

gui :: IO ()
gui = do
        f <- frame
        let s = map (\t -> staticText f [text := show t]) [1..10]
        set f [layout := margin 10 ( row 2 $ map (\x -> (widget x)) s)]

I have no experience at all with wxHaskell. But for the sake of forward
motion, substituting with "f <- frame []" should work.

-- Kim-Ee
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