hashes of hashes not supported

[Maxim Fomin]

On Friday, 9 November 2012 at 17:58:27 UTC, Dan wrote:
>>> I don't think making postblit accept const works - did it for 
>>> you? If you just mean "this(const this)" it does make it 
>>> compile - but that postblit is not called.
>>>
>>
>> Making parameter to be const solves that problem.
>
> Not to me. Sorry if I'm missing something, but a solution would 
> be that it not only compile, but it invoke my this(const this) 
> postblit, which unless I'm missing something it does not.
>

I understood that the problem is in non-compiling.

>> Look at this: http://dpaste.dzfl.pl/1f60055d. It is a 
>> combination of original code and code above. It fails to 
>> compile, but commenting this(this) makes dmd happy. 
>> Alternatively you can comment S[S[string]] w1, w2 and 
>> everything also works fine.
>
> Look at this: http://dpaste.dzfl.pl/95d40612
> I commented out this(this) and dmd is happy, but I am not 
> because nothing is printed. This is quite bad because I think 
> I'll be duping all my members but it won't get called and 
> sharing will ensue. What am I missing?
>
> Thanks,
> Dan

Well actually this(const this) appears to be not a copy 
constructor at all - thanks to treating func(Type) {} as 
func(Type _param_0){} it is converted to a regular constructor 
which may take arbitrary arguments and is irrelevant here. So, 
basically the problem is in:

struct S {
   this(this) {  }
}

void main() {
   S[S[string]] w1,w2;
   assert(w1==w2); //template instance error instantiating
}