Since you're retaining foreign language finalizers, you need a way
to get the equivalent of Marshal.Alloc.free as such a finalizer, as
discussed in
http://www.haskell.org/pipermail/ffi/2002-September/000729.html
I favour option (3) from there:
Marshal.Alloc.finalizerFree :: FunPtr (Ptr a -> IO ())
but doing (4) as well would be harmless, I guess.
And then there is the small matter that GHC doesn't currently implement
foreign language finalizers, or finalizer ordering.
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