[GHC] #10181: Lint check: arity invariant

[GHC]

#10181: Lint check: arity invariant
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        Reporter:  nomeata           |                   Owner:  nomeata
            Type:  task              |                  Status:  infoneeded
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      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):

 branch `wip/T10181`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10181#comment:3>
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