Self-referential struct mixins

[rbscott]

On Sunday, 17 November 2019 at 17:35:07 UTC, Elie Morisse wrote:
>
> It's part of a bigger family of issues caused by how DMD's 
> semantic analysis is architectured. I tried to tackle it some 
> time ago but didn't see it through the end :
>
> https://github.com/dlang/dmd/pull/7018
> https://forum.dlang.org/post/auvbfyzmqjxtfhkvmkxu@forum.dlang.org
>
> As I see it the proper fix requires rewritting a large part of 
> the compiler frontend, but this is definitely something worth 
> doing at some point to make DMD less brittle esp. regarding 
> advanced usage of mixins/CTFE (I don't have time anymore, and 
> IMHO someone should be paid 2 months to work full-time on 
> re-architecturing DMD for this)
>
>

Thanks for pointing that out. Given what you understand about the 
issue, do you have any recommendations for working around this? I 
am pretty sure a string mixin will work, but hopefully there is 
an alternative. Maybe a different compiler will work?

> Forward declaring structs isn't allowed in D.

I did try forward declarations. I thought because of "Opaque 
Pointers", this would work, but it generates a compiler error.