> The other thing that strikes me about this is don't we also have
> the same potential problem with weak pointer finalisers? Can they
> be supported in Haskell without pre-emptive concurrency?
Weak pointers are a GHC-only extension too, at the moment. They require
some careful GC algorithms as well as support for Haskell finalisers.
GHC uses weak pointers to implement ForeignPtr internally.
Cheers,
Simon
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