March 17, 2013
Anyone have any idea what this means?

Error: template instance TupleWrapper!(i, i) TupleWrapper!(i, i) is nested in both S and D

I don't have a minimal testcase, but I can try to create one if it's difficult to see otherwise.
March 18, 2013
On Sunday, 17 March 2013 at 21:22:44 UTC, simendsjo wrote:
> Anyone have any idea what this means?
>
> Error: template instance TupleWrapper!(i, i) TupleWrapper!(i, i) is nested in both S and D
>
> I don't have a minimal testcase, but I can try to create one if it's difficult to see otherwise.

This means that template instance touches more than one context and since D implementation currently allows to have one single context pointer, the code is rejected. There is issue in bugzilla, and it is not fixed.