[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 nomeata):

 Hi,

 Replying to [comment:2 simonpj]:
 > This looks like a bug in the SOURCE-import mechanism to me.
 > […]
 > Bother.  Well I suppose it would be good to open a separate ticket about
 that.

 I would, but I’m not able to summarize what precisely is wrong here, and
 how to phrase the ticket.

 > But I'll stick to my guns about `idArity <= typeArity` for now.  See
 `Note [exprArity invariant]` in `CoreArity`.
 >
 > Did you find any other cases?

 Not yet, as I stumbled over this while building GHC. I can make it a lint
 warning for now and see what else comes up.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10181#comment:4>
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