[GHC] #9636: Function with type error accepted

[GHC]

#9636: Function with type error accepted
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        Reporter:  augustss          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by adamgundry):

 I like idea of using an `Error` type family, but I don't think this should
 be automatic for all closed type families, or at least there should be
 some way to switch it off (see Phab:D481).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9636#comment:23>
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