std.traits.ParameterDefaults implementation

[Meta]

On Monday, 8 April 2019 at 18:57:59 UTC, Adam D. Ruppe wrote:
> Is the Phobos implementation just working around compiler bugs 
> that have since been fixed? Or am I missing something else in 
> there?

If I had to guess, I would say it's a combination of this, as 
well as the fact that this template is 7 years old:

https://github.com/dlang/phobos/commit/c8daf366230356c338f1dc3631bceca8f575e3fa

I was only starting to look into D in winter of 2012, so I don't 
know if compile-time metaprogramming was very widely-used at the 
time, or if the necessary idioms and best practices had developed 
yet.