FFI, safe vs unsafe

[Claus Reinke]

here's another possible way to look at the complexities, and interactions 
of FFI and Haskell' concurrency:

- we've been told here that concurrency is just a library
- GHC implements such a library
- all Haskell' implementations will support FFI
- FFI allows GHC to export that concurrency library
- FFI allows other Haskell' implementations to import that library
==> all Haskell' implementations can support GHC-style concurrency

even if that looks like one of those 0==1 proofs, it might still be 
worthwhile to discuss this as a concrete example, to highlight the
difficulties?-)

cheers,
claus