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When compiling the files below using ghc --make Main.hs I get the following error:

[1 of 5] Compiling ModuleA[boot]    ( ModuleA.hs-boot, nothing )
[2 of 5] Compiling ModuleC          ( ModuleC.hs, ModuleC.o )
[3 of 5] Compiling ModuleB          ( ModuleB.hs, ModuleB.o )
Loading package base ... linking ... done.
Loading package template-haskell ... linking ... done.
ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for powerpc-apple-darwin):
        Maybe.fromJust: Nothing

ModuleA.hs:

module ModuleA where

import ModuleB

ModuleA.hs-boot:

module ModuleA where

ModuleB.hs:

{-# OPTIONS -fth #-}
module ModuleB where

import ModuleC

$(nothing)

ModuleC.hs:

module ModuleC where

import Language.Haskell.TH

import {-# SOURCE #-} ModuleA

nothing = return [] :: Q [Dec]

Main.hs:

module Main.hs

import ModuleA

main = return ()

Trac metadata

Trac field	Value
Version	6.6
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	MacOS X
Architecture	powerpc