Indeed. I think the point is that Ptr should be thought of as tied to Storable. If you want to use an Addr# for something else, then you shouldn't be using Ptr!

On Thu, Nov 1, 2018, 2:13 PM Evan Laforge <qdunkan@gmail.com wrote:

On Thu, Nov 1, 2018 at 10:47 AM Carter Schonwald
<carter.schonwald@gmail.com> wrote:
> a good example might be Ptr Char.  Is this a single location of a 32bit / utf32 code point, or an array of utf8 code points or utf32 code points?
> is it null terminated vs there being an extra sequence length? These are all valid things that can be happening. And

I'm not sure if it affects your point, but I sure hope a 'Ptr Char'
points to a 4 byte haskell Char as it claims, and 'Ptr CChar' points
to a 1 byte C char, as it claims.  Otherwise, sizeOf will be wrong and
array indexing will go out of bounds.

Of course, in the C case, whether or not there are further chars after
that and if they are terminated and what is the encoding is all
ambiguous, as it always is for C.
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