Thoughts on Herb Sutter's Metaclasses?

[Joakim]

On Tuesday, 10 April 2018 at 01:21:07 UTC, Chris Katko wrote:
> One more note: It seems like this would be heaven for trying 
> out new language features without having to "manually" add them 
> into the compiler first. By hijacking the syntax to AST stage, 
> we can add new constructs with real-functioning code, and have 
> others evaluate themselves and unit test them without having to 
> "imagine" whether the code would actually work. It'd be on a 
> real binary, using a real (unmodified!) compiler.
>
> And you can also have your own "in-house" specializations. 
> Which is no different than expecting people to use your API. 
> Some API's have method chaining, and you use it. Some have 
> pass-by-name, and you use it.

See previous forum thread on the topic, with Walter chiming in a 
bit too:

https://forum.dlang.org/thread/kglnxqbcugerhynngewp@forum.dlang.org