[GHC] #9441: CSE should deal with letrec

[GHC]

#9441: CSE should deal with letrec
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      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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Changes (by simonpj):

 * status:  closed => new
 * resolution:  fixed =>


Comment:

 Blimey you are right.   Yes, this patch also implements CSE for recurive
 bindings, as described by `Note [CSE for recursive bindings]`.

 At least I wrote the Notes!

 A regression test would be good...re-opening just for that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9441#comment:4>
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