Is old style compile-time foreach redundant?

[Seb]

On Sunday, 7 January 2018 at 01:52:10 UTC, Ali Çehreli wrote:
> On 01/06/2018 04:55 PM, Stefan Koch wrote:
>
> > When you can use the old style do so. Since it puts less
> stress on the
> > compiler in the general case.
>
> My question is related to how to update my book. If the 
> difference is mainly about performance, I think I will cover 
> 'static foreach' but also mention old style foreach as a note.
>
> Ali

How about doing sth. similar like for DIP1003?

https://dlang.org/spec/contracts.html#pre_post_contracts

> Since DIP1003 has been applied the actual function body starts 
> with do. In the past, body was used, and could still be 
> encountered in old code bases.