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Forked from Glasgow Haskell Compiler / GHC
64278 commits behind the upstream repository.
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[project @ 1999-11-25 10:35:47 by simonpj]
Simon Peyton Jones authored 
Better error message when trying to derive classes for
existentially-quantified data constructors.

And a general slight tidy up in TcDeriv
cb5f88f0
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