[GHC] #11728: Core lint errors

[GHC]

#11728: Core lint errors
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           Reporter:  Iceland_jack   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I have an older version (8.1.20160117), does this still occur?

 Compiling with `ghci -dcore-lint -ignore-dot-ghci`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11728>
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