It's the syntax for unboxed tuple. See: http://www.haskell.org/ghc/docs/latest/html/users_guide/primitives.html#unbo... http://www.haskell.org/ghc/docs/latest/html/users_guide/primitives.html#unbo...Best regards, Krzysztof Skrzętnicki On Sun, Apr 10, 2011 at 19:29, Amitava Shee wrote:

I came across this definition in ghc source

$GHC/compiler/utils/State.hs ======================= newtype State s a = State { runState' :: s -> (# a, s #) }

What does the construct (# a, s #) mean?

Thanks & Regards, Amitava Shee

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