Changes made by GADT commit conflict with -O2 flag

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> The last 30 lines of 
> /Users/sseefried/cvs-ghc/HEAD/logs/HEAD-cmis-stage2 are
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> utils/PrimPacked.lhs:244:0:
>     Warning: foreign declaration uses deprecated non-standard syntax
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> utils/PrimPacked.lhs:248:0:
>     Warning: foreign declaration uses deprecated non-standard syntax
>
> utils/PrimPacked.lhs:251:0:
>     Warning: foreign declaration uses deprecated non-standard syntax
>
> utils/PrimPacked.lhs:254:0:
>     Warning: foreign declaration uses deprecated non-standard syntax
>
> utils/PrimPacked.lhs:257:0:
>     Warning: foreign declaration uses deprecated non-standard syntax
> ghc-6.3: panic! (the `impossible' happened, GHC version 6.3):
>         app_match: unbound tpl s{tv a1E9}

Hi all,

Believe it or not I've been compiling the GHC HEAD stage 2 compiler 
with the -O2 flag and it doesn't seem to be playing very nicely with 
the changes recently committed for the GADT feature. This panic is 
emitted by specialise/Rules.lhs

If I use the flag the -O utils/PrimPacked.lhs will still compile.

Sean