Status update: after checking out the latest HEAD and building it, the
above error does not occur:
$ ~/ghc-head/bin/ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.9.20080720
$ ~/ghc-head/bin/ghc --make DerivingError.hs
<no location info>:
Warning: -fallow-overlapping-instances is deprecated: Use the
OverlappingInstances language instead
[1 of 1] Compiling DerivingError ( DerivingError.hs, DerivingError.o )
$
However, this doesn't exactly help your immediate problem, and it
likely won't until 6.10.1 is released, as 6.8.3 is going to be the
last release of the 6.8 branch.
Truly sorry I couldn't have helped you more.
Austin
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