[GHC] #12630: Assertion failed with BuildFlavour = devel2

[GHC]

#12630: Assertion failed with  BuildFlavour = devel2
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        Reporter:  pacak             |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by pacak):

 It's 5 files blob now. I'll put it somewhere once I get to my computer.1
 hour or so.
  There are similar failures all over our codebase, the biggest one is over
 3k lines long

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12630#comment:14>
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