[GHC] #12406: New not-in-scope behaviour + deferred typed holes = disappearing error messages

[GHC]

#12406: New not-in-scope behaviour + deferred typed holes = disappearing error
messages
-------------------------------------+-------------------------------------
        Reporter:  ertes             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12170            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * failure:  None/Unknown => Incorrect warning at compile-time
 * related:   => #12170


Comment:

 This can serve as a test case for #12170.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12406#comment:2>
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