[GHC] #8707: Kind inference fails in data instance definition

[GHC]

#8707: Kind inference fails in data instance definition
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        Reporter:  goldfire          |            Owner:  jstolarek
            Type:  bug               |           Status:  new
        Priority:  normal            |        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 jstolarek):

 Replying to [comment:4 simonpj]:
 > Jan, how did you manage to get GHC to produce this?
 > {{{
 >   Data constructor `SFalse' returns type `SingDF
 >                                           Bool k ('(,) Bool (k -> *)
 'False (Ctor k))'
 > }}}
 > That does look wrong.  Can you explain how to reproduce it?
 That is part of error message produced by GHC 7.6.3. As for this output:

 {{{
 Data constructor ‘SFalse’ returns type ‘SingDF
                                           Bool k '(Bool, k -> *, 'False,
 Ctor k)’
 }}}

 I made a quick hack in `pprTcApp` and replaced `ty_args = drop arity tys`
 with `ty_args = tys`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8707#comment:5>
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