ghci `Probable fix' non-exhaustive pattern exception

Good evening,

the following says it all:

~% /var/tmp/ghc/bin/ghci /tmp/foo.hs
   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.4.20050215, for Haskell 
98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base-1.0 ... linking ... done.
Compiling Main             ( /tmp/foo.hs, interpreted )

/tmp/foo.hs:64:6:
    No instance for (Show c)
      arising from use of `show' at /tmp/foo.hs:64:6-9
    Probable fix:*** Exception: typecheck/TcSimplify.lhs:2389:8-82: 
Non-exhaustive patterns in function add_ors

> 


The "work-in-progress" source causing it is attached.

Happy hacking,
Remi

-- 
Nobody can be exactly like me. Even I have trouble doing it.

foo.hs
Description: Text document

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