patch applied (ghc): Extend the local bindings at a breakpoint with one for the wrapped expression

[Pepe Iborra]

Fri Feb  2 03:26:29 PST 2007  Pepe Iborra <mnislaih at gmail.com>
  * Extend the local bindings at a breakpoint with one for the wrapped expression
  
  By popular request, in a breakpoint it is possible now to inspect the result of the expression wrapped by the breakpoint.
  
  The user interface for this is right now preliminar; there is a new binding called '_result' at every breakpoint. Suggestions are welcome!
  

    M ./compiler/deSugar/DsBreakpoint.lhs -3 +5
    M ./compiler/deSugar/DsExpr.lhs -1 +5
    M ./compiler/main/GHC.hs -2 +8