patch applied (ghc): Fix a recomp bug: make classes/datatypes depend directly on DFuns (#4469)

[Simon Marlow]

Thu Dec  2 04:23:49 PST 2010  Simon Marlow <marlowsd at gmail.com>
  * Fix a recomp bug: make classes/datatypes depend directly on DFuns (#4469)
  And remove the old mechanism of recording dfun uses separately,
  because it didn't work.
  
  This wiki page describes recompilation avoidance and fingerprinting.
  I'll update it to describe the new method and what went wrong with the
  old method:
  
  http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance

    M ./compiler/deSugar/Desugar.lhs -1 +1
    M ./compiler/iface/MkIface.lhs -29 +15
    M ./compiler/typecheck/TcRnMonad.lhs -4 +2
    M ./compiler/typecheck/TcRnTypes.lhs -14 +5
    M ./compiler/typecheck/TcSMonad.lhs -24 +2

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101202122349-12142-36441f155aaa7a6ef2ba8d07a07a64790affb30b.gz