how to initialise const variables

[cym13 via Digitalmars-d-learn]

On Friday, 26 February 2016 at 03:18:02 UTC, Nicholas Wilson 
wrote:
> On Friday, 26 February 2016 at 02:48:35 UTC, cym13 wrote:
>> On Friday, 26 February 2016 at 02:32:44 UTC, Nicholas Wilson 
>> wrote:
>>> struct A
>>> {
>>>      const (void *) p;
>>> }
>>>
>>> struct B
>>> {
>>>     A    a;
>>>     this(void * _p)
>>>     {
>>>         a.p = _p;
>>>     }
>>> }
>>>
>>> I cannot change the definition of A
>>> how do I initialise b.a.p?
>>
>> As you did:
>>
>>     void main() {
>>         int i = 42;
>>         B b = B(&i);
>>         int* p = cast(int*)b.a.p;
>>         assert(*p == 42);
>>     }
>
>>         a.p = _p;
> fails to compile
> fixed by
> a = typeof(a)(_p);

What compiler and version are you using ? Because I literally 
just copied your example and added my main and got no error.