Validity of cast(void*)size_t.max

[Steven Schveighoffer]

On 3/5/18 1:08 PM, Stefan Koch wrote:
> On Monday, 5 March 2018 at 18:04:20 UTC, Nordlöw wrote:
>> On Monday, 5 March 2018 at 16:07:49 UTC, Steven Schveighoffer wrote:
>>> No, I mean you call holeKey at *runtime*. Inlined, it's just 
>>> returning a constant, so it should reduce to a constant.
>>
>> A compile-time constant visible to the optimizer?
> 
> Yes indeed. For gdc and ldc the optimisation is guranteed and I am quite 
> dmd can do this as well. As long as you don't have too many statements.

Note, I think the error is bogus, you should be able to create 
hard-coded addresses of data at compile time -- I'm not sure how you 
would do hardware registers otherwise.

Another possibility I thought of:

struct Dummy
{
     size_t nullValue;
     void *holeKey;
}

enum holeKey = &(cast(Dummy *)null).holeKey;

But this fails as well

Error: dereference of null pointer null

-Steve