[GHC] #10285: Bug in Coerciible

[GHC]

#10285: Bug in Coerciible
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        Reporter:  simonpj           |                   Owner:  goldfire
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by simonpj):

 Also add a check in Lint

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10285#comment:2>
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