http://darcs.haskell.org/packages/cgi-undecidable/
There only 3 or 4 lines of source code, but it can't be installed.
The ghc version is 6.6 .
Undecidable.hs:23:0:
Duplicate instance declarations:
instance [overlap ok] (MonadTrans t, MonadCGI m, Monad (t m)) =>
MonadCGI (t m)
-- Defined at Undecidable.hs:23:0
instance [overlap ok] (MonadTrans t, MonadCGI m, Monad (t m)) =>
MonadCGI (t m)
-- Defined in Network.CGI.Monad
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