[GHC] #11064: Call Arity has the trivial application case wrong

[GHC]

#11064: Call Arity has the trivial application case wrong
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        Reporter:  nomeata           |                Owner:  nomeata
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  7.10.3
       Component:  Compiler          |              Version:  7.10.2
      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 bgamari):

 Is there some way we could formulate a test for this?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11064#comment:4>
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