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GADT proofs of FunDeps?
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Roberto Zunino  
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 More options Jan 3 2007, 9:28 pm
Newsgroups: fa.haskell
From: Roberto Zunino <zun...@di.unipi.it>
Date: Thu, 04 Jan 2007 02:28:31 UTC
Local: Wed, Jan 3 2007 9:28 pm
Subject: [Haskell-cafe] GADT proofs of FunDeps?
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I am investigating mixing FunDeps with the type equality GADT

    data Teq a b where Teq :: Teq a a

Basically, I would like to write something like

    proof :: (C a b1, C a b2) => Teq b1 b2
    proof = unsafeCoerce# Teq

provided the FunDep

    class C a b | a -> b

Is this safe? Any caveat?

Regards,
Roberto Zunino.
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