[GHC] #12156: -fdefer-typed-holes causes panic on unbound variable

[GHC]

#12156: -fdefer-typed-holes causes panic on unbound variable
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        Reporter:  osa1              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10569            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * component:  Compiler => Compiler (Type checker)
 * related:   => #10569


Comment:

 The example from the description of #10569 fails with the same panic (it
 was unfortunately never added to the testsuite), so commit
 fb7b6922573af76a954d939c85e6af7c39a19896 might be involved.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12156#comment:1>
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