[GHC] #8946: Using hdevtools caused "Evaluated the place holder for a PostTcKind"

[GHC]

#8946: Using hdevtools caused "Evaluated the place holder for a PostTcKind"
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        Reporter:  tbelaire      |            Owner:
            Type:  bug           |           Status:  new
        Priority:  normal        |        Milestone:
       Component:  Compiler      |          Version:  7.8.1-rc1
      Resolution:                |         Keywords:
Operating System:  MacOS X       |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Comment (by simonpj):

 That field is filled in by the type checker. If you look at it before
 then, you get the error thunk. I don't think it's a GHC bug.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8946#comment:2>
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