[GHC] #12668: Program that fails Core Lint terribly

[GHC]

#12668: Program that fails Core Lint terribly
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       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:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 What's wrong here? My first worry is that Core Lint is doing the wrong
 thing. And does your `Some` type enter the picture?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12668#comment:2>
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