id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
1186	GHC as a library panic on loading second module	ArthurVanLeeuwen	simonmar	"Given the following two modules:

{{{
module GHCLibTest where

import GHC
import PackageConfig
import DynFlags

main = do session <- newSession JustTypecheck (Just ""/usr/local/lib/ghc-6.6"")
          f <- getSessionDynFlags session
          f' <- parseDynamicFlags f [""-isrc"",""-ilib"",""-ilib/DData"",""-fglasgow-ex
ts"",""-package wx""]
          setSessionDynFlags session (fst f'){hscTarget = HscInterpreted}
          let preludeModule = mkModule (stringToPackageId ""base"") (mkModuleName
""Prelude"")
          setContext session [] [preludeModule]
          t <- guessTarget ""src/Main.hs"" Nothing
          addTarget session t
          load session LoadAllTargets
}}}

and


{{{
module OtherModule where

import Data.List

type Nummer = String

data Beademing = HFO | CPAP | IPPV | Geen       
    deriving (Show, Read, Eq)
data Bloeddruk = Hypertensie | Hypotensie | TensieNormaal       
    deriving (Show, Read, Eq)
data Partus = PartusTeVroeg | PartusNormaal     
    deriving (Show, Read, Eq)
}}}

the following results:


{{{
harlan:~/Werk/dss/software/ghclib arthurvl$ echo ""main"" | ghci -package ghc ghclibtest.hs
   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.6, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.
Loading package template-haskell ... linking ... done.
Loading package readline-1.0 ... linking ... done.
Loading package unix-1.0 ... linking ... done.
Loading package Cabal-1.1.6 ... linking ... done.
Loading package regex-base-0.71 ... linking ... done.
Loading package regex-posix-0.71 ... linking ... done.
Loading package regex-compat-0.71 ... linking ... done.
Loading package haskell98 ... linking ... done.
Loading package ghc-6.6 ... linking ... done.
[1 of 2] Compiling OtherModule      ( OtherModule.hs, interpreted )
[2 of 2] Compiling GHCLibTest       ( ghclibtest.hs, interpreted )
Ok, modules loaded: OtherModule, GHCLibTest.
*GHCLibTest> ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for powerpc-apple-darwin):
        lookup_dfun main:OtherModule.$f1{v r5ig} [lid]

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

*GHCLibTest> Leaving GHCi.
harlan:~/Werk/dss/software/ghclib arthurvl$ 
}}}

This does not just occur for this recursive case, but
also for cases where the main module is from some
completely different program."	bug	closed	high	6.8.1	GHC API	6.6	fixed			Unknown/Multiple	powerpc		Unknown