Hi I'm trying to make the hint library work also with ghc 7 and I'm having problems with some test-cases that are now raising exceptions. I've been able to reduce the problem to a small example. The program below runs ghc in interpreter-mode and attempts to parse an statement using ghc's parseStmt function; the particular statement is a let-expression with a \n in the middle. The observed behaviour is:
$ ghc-6.12.1 -fforce-recomp --make -package ghc -cpp -Wall d.hs && ./d [1 of 1] Compiling Main ( d.hs, d.o ) Linking d ... let {e = let x = () in x ;} in e Ok $ ghc-7.0.1 -fforce-recomp --make -package ghc -cpp -Wall d.hs && ./d [1 of 1] Compiling Main ( d.hs, d.o ) Linking d ... let {e = let x = () in x ;} in e d: d: panic! (the 'impossible' happened) (GHC version 7.0.1 for i386-apple-darwin): srcLocCol <no location info>
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Is it a regression or should I be doing this some other way? Thanks, Daniel -- d.hs import qualified GHC import qualified MonadUtils as GHC ( liftIO ) import qualified StringBuffer as GHC import qualified Lexer as GHC import qualified Parser as GHC import qualified GHC.Paths main :: IO () main = GHC.runGhcT (Just GHC.Paths.libdir) $ do -- initialize df0 <- GHC.getSessionDynFlags _ <- GHC.setSessionDynFlags df0{GHC.ghcMode = GHC.CompManager, GHC.hscTarget = GHC.HscInterpreted, GHC.ghcLink = GHC.LinkInMemory, GHC.verbosity = 0} df1 <- GHC.getSessionDynFlags -- runParser let expr = "let {e = let x = ()\nin x ;} in e" GHC.liftIO $ putStrLn expr buf <- GHC.liftIO $ GHC.stringToStringBuffer expr let p_res = GHC.unP GHC.parseStmt (mkPState df1 buf GHC.noSrcLoc) case p_res of GHC.POk{} -> GHC.liftIO $ putStrLn "Ok" GHC.PFailed{} -> GHC.liftIO $ putStrLn "Failed" where #if __GLASGOW_HASKELL__ >= 700 mkPState = GHC.mkPState #else mkPState = \a b c -> GHC.mkPState b c a #endif