simons:
> I have been trying to compile the docon package, which is
> available from <http://www.haskell.org/docon/>, but despite
> serious efforts, I failed. It appears that ghc goes into an
> infinite loop when compiling the module pol/factor/Pfact__.hs.
> The compiler doesn't issue any warnings or errors, but I just
> won't return.
> 
> When compiling the source code with ghc 6.0, everything works
> fine though, so I guess, this really is a bug in the current
> HEAD version.
> 
> To re-produce this error (on Unix), do as follows:
> 
>     wget http://haskell.org/docon/distrib/2.06/docon-2.06.zip
>     mkdir docon-test && cd docon-test
>     unzip -a ../docon-2.06.zip
>     cd docon/source/
>     mkdir export
>     make ghc=ghc-6.3 s=`pwd` obj

I tested it on the following GHC/platform combinations:

* 6.0.1   linux-x86    
Bug not observed

* 6.2     irix-mips64
It triggered a known bug with the Oct 23, GHC 6.2, mips64 port:

        ghc-6.2: internal error: update_fwd: unknown/strange object  0
            Please report this as a bug to [EMAIL PROTECTED],
            or http://www.sourceforge.net/projects/ghc/
        *** Error code 254 (bu21)

* 6.2     linux-ia64  
Triggered an _unknown_ bug on the Sep 14th, GHC 6.2, for ia64:

    ghc-6.2: internal error: scavenge_mark_stack: unimplemented/strange closure
            type 801560 @ 0x2000000001629200 
        Please report this as a bug to [EMAIL PROTECTED],
        or http://www.sourceforge.net/projects/ghc/
    make: *** [obj] Error 254

Conclusion: this program should go in the test suite!

-- Don
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