[GHC] #3458: Allocation where none should happen

[GHC]

#3458: Allocation where none should happen
---------------------------------+----------------------------------
        Reporter:  guest         |            Owner:
            Type:  bug           |           Status:  new
        Priority:  lowest        |        Milestone:  7.6.2
       Component:  Compiler      |          Version:  6.10.4
      Resolution:                |         Keywords:
Operating System:  Linux         |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Comment (by nomeata):

 Just for the record: The code
 {{{
 #!haskell
 f x = let g y = if y then x else g y
       in case g x of
            True -> False
            False -> True
 }}}
 in comment:5 would also be improved by the common context transformation
 proposed here: http://www.haskell.org/pipermail/ghc-
 devs/2013-December/003481.html

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3458#comment:16>
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