Possible bug when instantiating template function with nested struct

[Teodor Dutu]

I think the issue of array representation is a serious enough 
topic that it deserves its own separate thread. In addition, this 
issue is outside the scope of initial question, which revolves 
around the bug highlighted here:
- https://issues.dlang.org/show_bug.cgi?id=8850
- https://issues.dlang.org/show_bug.cgi?id=8863

Do you have any suggestions about it?