[GHC] #14000: Out of scope errors with type families do not mention scope

[GHC]

#14000: Out of scope errors with type families do not mention scope
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        Reporter:  EyalLotem         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  TypeFamilies
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 The `Couldn't match expected type` error snuck in after
 fb7b6922573af76a954d939c85e6af7c39a19896 (`Treat out-of-scope variables as
 holes`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14000#comment:5>
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