Tue Oct 16 05:47:10 PDT 2007  [EMAIL PROTECTED]
  * Fix #1662: do not simplify constraints for vanilla pattern matches
  
  See Note [Arrows and patterns] in TcPat.  
  
  This fixes Trac 1662.   Test is arrows/should_compile/arrowpat.hs
  
  Please merge
  

    M ./compiler/typecheck/TcPat.lhs -17 +55

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