[GHC] #5344: CSE should look through coercions

[GHC]

#5344: CSE should look through coercions
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        Reporter:  reinerp           |                Owner:  simonpj
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  7.0.3
      Resolution:  duplicate         |             Keywords:  cse
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):

 Indeed it is easier as it can done by task. But I still believe type-
 changing CSE on the Core level is a research paper quality problem (and an
 interesting one!). We could keep this ticket open for that point in the
 design space, so if you want, feel free to reopen.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5344#comment:6>
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