[GHC] #15466: debug validation failures

[GHC]

#15466: debug validation failures
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        Reporter:  alpmestan     |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  8.5
      Resolution:                |             Keywords:
Operating System:  Linux         |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by bgamari):

 Hmm, I'm a bit confused; the references to `PprC` makes me think that this
 is being built unregisterised for some reason.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15466#comment:1>
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