patch applied (ghc): Attach free variables rather than in-scope variables to breakpoints

[Simon Marlow]

Thu Apr 26 03:11:27 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * Attach free variables rather than in-scope variables to breakpoints
  This speeds up the debugger quite a bit, we're now only about 30%
  slower than ordinary GHCi, and still adding breakpoints to every
  sub-expression.  Also we now get to see the free variables in
  recursive bindings, which wasn't working properly before.

    M ./compiler/deSugar/Coverage.lhs -49 +97