[GHC] #10719: Malformed data type quotation accepted

[GHC]

#10719: Malformed data type quotation accepted
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        Reporter:  heisenbug         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Template Haskell  |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by heisenbug):

 Here is the rest of the diagnosis:
 {{{
 compiler/deSugar/DsMeta.hs:626:  | Just (_, tys) <- hsTyGetAppHead_maybe
 res_ty
 }}}

 Name if the constructor (or whatever) is ignored here.

 We should know whether it is a constructor/variable and and check against
 the GADT name (when constructor) otherwise issue an extra equality
 constraint.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10719#comment:3>
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