GreenCard (How to Marshell Int64)

[Sven Panne]

Liwen Huang wrote:
>     Oops. My "long" is indeed Int32 :(. Thank you for pointing that out.

To avoid surprises like this, have a look at:

    http://haskell.org/ghc/docs/latest/html/base/Foreign.C.Types.html

On the other hand, when you really want to fix the sizes of the integral
types, use e.g. Int32 on the Haskell side and int32_t on the C side.

Cheers,
    S.