[GHC] #9601: Make the rewrite rule system more powerful

[GHC]

#9601: Make the rewrite rule system more powerful
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       Reporter:  spacekitteh        |                   Owner:
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Compiler           |                 Version:  7.8.2
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Project (more      |         Type of failure:
  than a week)                       |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
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 It would be amazing if the current RULES system could be upgraded to
 include various predicates, or even into a full-on strategic programming
 system. This would allow far far more optimisations to be possible, rather
 than the current conservative system where you have to make sure that the
 optimisations ALWAYS apply.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9601>
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