[Haskell-cafe] "plugins" fails on a simple example

Jeremy Shaw jeremy at n-heptane.com
Mon Sep 16 23:12:11 CEST 2013


plugins probably needs to be patched[1]. I'll happily apply such a patch.

- jeremy
[1] or rewritten from the ground up


On Mon, Sep 16, 2013 at 2:49 AM, Petr Pudlák <petr.mvd at gmail.com> wrote:

>  Hi,
>
> I'm playing with “plugins”, trying to evaluate a simple expression:
>
> import Control.Monadimport System.Eval.Haskell
> main = do
>     let fExpr = "1 + 2 :: Int"
>     r <- eval_ fExpr ["Prelude"] [] [] []
>             :: IO (Either [String] (Maybe Int))
>     case r of
>         Right (Just f)  -> do
>             print $ f
>         Left err -> putStrLn $ "Error: " ++ unlines err
>         _ -> putStrLn $ "Unknown error."
>
> However, it fails with
>
> Error:
> on the commandline: Warning:
>     -fglasgow-exts is deprecated: Use individual extensions instead
>
> Am I doing something wrong? How can I turn off the flag?
>
> I'm using GHC 7.6.3.
>
> Thanks,
> Petr
>
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