[GHC] #10417: Rule matching not "seeing through" floating and type lambda (and maybe cast)

[GHC]

#10417: Rule matching not "seeing through" floating and type lambda (and maybe
cast)
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        Reporter:  duncan            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 From looking hard at these examples, I would say it “just” floating out
 getting into the way for applying rules, which is a general problem. At
 least for the `artificial_example`. Hard to predict if the casts would get
 in the way if the float out would not prevent the rule from firing in the
 simple case, but one step at a time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10417#comment:5>
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