`StablePtr` in `ST`

[David Feuer]

So something like

newtype StablePtr a = StablePtr (StablePtrST RealWorld a)?

I suppose that could work with some discipline. You have to assume that
foreign code doesn't pick its address out of a hat and so something silly,
but I guess you pretty much have to assume that anyway.

On Wed, Aug 21, 2019, 5:00 AM Matthew Farkas-Dyck <strake888 at gmail.com>
wrote:

> I have been doing some work where i want `StablePtr`, but also to not
> be confined to `IO`. I saw the following comment in
> "compiler/prelude/PrimOp.hs":
>
> Question: Why @RealWorld@ - won't any instance of @_ST@ do the job? [ADR]
>
> It has been there for 20 years. What is the answer? If it is safe i'll
> send the patch generalizing these operations.
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