[GHC] #1356: "derive instance" panics ghc-6.7.20070404

[GHC]

#1356: "derive instance" panics ghc-6.7.20070404
-----------------------------+----------------------------------------------
  Reporter:  kramer at acm.org  |          Owner:                   
      Type:  bug             |         Status:  new              
  Priority:  normal          |      Milestone:                   
 Component:  Compiler        |        Version:  6.7              
  Severity:  normal          |       Keywords:  deriving instance
Difficulty:  Unknown         |             Os:  MacOS X          
  Testcase:                  |   Architecture:  powerpc          
-----------------------------+----------------------------------------------
I've been happy to see the support for "dervice instance". In the past
 I've had to make a copy of parsec, just to dervice Data and Typeable for
 the Pos type in order to do SYB on my AST.

 Unfortunately "dervive instance" panics the 6.7 compiler at the moment (I
 need/want 6.7 since the -fhpc support rocks!).

 > import Text.ParserCombinators.Parsec.Pos as PPos
 > ...
 > derive instance Data PPos.SourcePos

 TLACodeGen.hs:485:0:ghc-6.7.20070404: panic! (the 'impossible' happened)
   (GHC version 6.7.20070404 for powerpc-apple-darwin):
         newTyConRhs
     main:Text.ParserCombinators.Parsec.Pos.SourcePos{tc r1R}

 ----- SYSTEM -----
 yoghurt:~/sdev/specifica/australis reto$ ghc --version
 The Glorious Glasgow Haskell Compilation System, version 6.7.20070404

 yoghurt:~/sdev/specifica/australis reto$ uname -a
 Darwin yoghurt.local 8.8.0 Darwin Kernel Version 8.8.0: Fri Sep  8
 17:18:57 PDT 2006; root:xnu-792.12.6.obj~1/RELEASE_PPC Power Macintosh
 powerpc

 yoghurt:~/sdev/specifica/australis reto$ gcc -v
 Reading specs from /usr/lib/gcc/powerpc-apple-darwin8/4.0.0/specs
 Configured with: /private/var/tmp/gcc/gcc-4061.obj~8/src/configure
 --disable-checking --prefix=/usr --mandir=/share/man --enable-
 languages=c,objc,c++,obj-c++ --program-transform-
 name=/^[cg][^+.-]*$/s/$/-4.0/ --with-gxx-include-
 dir=/include/gcc/darwin/4.0/c++ --build=powerpc-apple-darwin8 --host
 =powerpc-apple-darwin8 --target=powerpc-apple-darwin8
 Thread model: posix
 gcc version 4.0.0 20041026 (Apple Computer, Inc. build 4061)

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1356>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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