[GHC] #8563: Deriving with PolyKinds broken

[GHC]

#8563: Deriving with PolyKinds broken
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        Reporter:  edsko             |            Owner:
            Type:  bug               |           Status:  new
        Priority:  high              |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 Thanks for the report, added as T8563 in a even simpler form:
 {{{
 {-# LANGUAGE PolyKinds #-}
 module Tagged where

 newtype Tagged s b = Tagged b deriving Eq
 }}}

 The problems goes away without `PolyKinds` so it is related to that.
 Probably the `k` option to `Tagged` should not be explicitly given here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8563#comment:1>
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