patch applied (ghc): BugFix: do not insert breakpoints around expressions with unlifted kind

[Pepe Iborra]

Wed Jan 31 02:28:21 PST 2007  Pepe Iborra <mnislaih at gmail.com>
  * BugFix: do not insert breakpoints around expressions with unlifted kind
  
    I have added a check, and while there removed a few kludges in my code.
    Kudos to -dcore-lint for uncovering this.
   
    I think that this restriction could be lifted, if GHC.Base.breakpoint could have kind ?? -> ??. But is this a legal type? Does not look so to me.
  

    M ./compiler/deSugar/DsBreakpoint.lhs -41 +46
    M ./compiler/deSugar/DsExpr.lhs +2