[GHC] #9214: UNPACK support for sum types

[GHC]

#9214: UNPACK support for sum types
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        Reporter:  mojojojo          |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by schyler):

 Smells fishy to me. Would create a pwr(N,2) number of denormalizations.

 Would be better to calculate the largest size of the fully unpacked type
 like a C compiler would for unions.

 o/t The behaviour of the trac for n^2 notation is really annoying!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9214#comment:1>
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