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# Exploiting nullary constructors
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Joachim [ writes](https://mail.haskell.org/pipermail/ghc-devs/2015-September/009831.html): The current proposed layout for a
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Joachim [writes](https://mail.haskell.org/pipermail/ghc-devs/2015-September/009831.html): The current proposed layout for a
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```wiki
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data D a = D a {-# UNPACK #-} !(Maybe a) would be
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