Thanks for the bug report. I am investigating. In the meantime you
could change the declaration of ArgrC from a 'newtype' to an ordinary
'data' declaration. It then compiles fine for me.
Hope this helps
regards
Kevin
Volker Wysk writes:
Hi.
ghc -fallow-undecidable-instances
Hi.
ghc -fallow-undecidable-instances -fglasgow-exts -fno-prune-tydecls -O2 \
-c -o Arglib.o Arglib.hs
panic! (the `impossible' happened):
mkWWcpr: not a product
g{-rku-}
- (g{-rku-},
PrelMaybe.Either{-r8t,i-}
((t{-rkv-} - tzq{-rkT-}) - tzq{-rkT-})
