GHC as a library error.

17 Oct 2011

      I'm trying GHC as a library, as documented in:

http://www.haskell.org/haskellwiki/GHC/As_a_library
http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/ghc-as-a-library.html

However, this code:

import GHC
import GHC.Paths ( libdir )
import DynFlags ( defaultDynFlags )

main =
    defaultErrorHandler defaultDynFlags $ do
      runGhc (Just libdir) $ do
        dflags <- getSessionDynFlags
        setSessionDynFlags dflags
        target <- guessTarget "test_main.hs" Nothing
        setTargets [target]
        load LoadAllTargets

Produces:

Couldn't match expected type `Severity'
            with actual type `DynFlags.Settings'
Expected type: DynFlags.LogAction
  Actual type: DynFlags.Settings -> DynFlags
In the first argument of `defaultErrorHandler', namely
  `defaultDynFlags'
In the expression: defaultErrorHandler defaultDynFlags

How can I fix it?

Paulo Pocinho

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