Range violation with AAs

[Nordlöw via Digitalmars-d-learn]

On Monday, 17 October 2016 at 18:22:53 UTC, Ali Çehreli wrote:
> Unfortunately, as far as I know, that's a privilege reserved 
> for built-in AAs.

But I *am* using a built-in AA. The problem happens when the 
value is an instance of an `Array!T`-container and not a slice 
`T[]`.