[GHC] #12092: Wrong error message with TypeApplications

[GHC]

#12092: Wrong error message with TypeApplications
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        Reporter:  kwf               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 This is actually representative of a class of suboptimal errors that I've
 seen while working with GHC 8, in that an out-of-scope identifier can
 cause a cascade of obscure type errors. Perhaps we should prioritize out-
 of-scope identifiers above other type errors.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12092#comment:1>
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