[Haskell-cafe] Support of multi-constructor types by UNPACK pragma

[Nikita Volkov]

Currently the pragma only supports single-constructor types. So in the
following example it will simply be ignored:

data A =
  A1 Char |
  A2 {-# UNPACK #-} !B

data B =
  B1 Int |
  B2 Bool

However it seems to be easily solvable by changing the type A to something
like the following during unpacking:

data A =
  A1 Char |
  A2_1 Int |    -- from B1
  A2_2 Bool     -- from B2

Am I missing something? Why is it not implemented?
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