How to return a reference to structs?

[Andrey Zherikov]

On Thursday, 4 November 2021 at 13:03:54 UTC, Paul Backus wrote:
> Have the lambda return by reference:
>
> ```d
> auto get()
> {
>     return idx.map!(ref (i) => a[i]);
> }
> ```

That works, thanks!