[GHC] #1806: panic when pattern matching infix constructors with too many arguments

[GHC]

#1806: panic when pattern matching infix constructors with too many arguments
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    Reporter:  guest                            |        Owner:         
        Type:  bug                              |       Status:  new    
    Priority:  normal                           |    Milestone:         
   Component:  Compiler                         |      Version:  6.8    
    Severity:  minor                            |   Resolution:         
    Keywords:  panic infix constructor pattern  |   Difficulty:  Unknown
          Os:  Unknown                          |     Testcase:         
Architecture:  Unknown                          |  
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Comment (by Isaac Dupree):

 I have the feeling that I've seen a use for three-argument case... maybe
 at the type level though, such as `(* -> *)` composition `([] :.: Maybe)`.
 Infix non-constructor functions like that are certainly allowed with
 currying, including defining them {{{(f . g) x = ...}}}.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1806#comment:2>
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