[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 tibbe):

 It's even more complicated than just allocating the max needed by any of
 the unpacked sum type's constructor. The GC needs to know what the fields
 are in any given constructor to be able to GC correctly. I don't think
 this will be hard (that's why we haven't done it already).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9214#comment:2>
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