patch applied (ghc-6.8/ghc): FIX Trac #1806: test for correct arity for datacon in infix pattern patch

[Ian Lynagh]

Mon Nov 19 03:43:01 PST 2007  simonpj at microsoft.com
  * FIX Trac #1806: test for correct arity for datacon in infix pattern patch
  
  Happily the fix is easy; pls merge
  

    M ./compiler/typecheck/TcPat.lhs -1 +2