http://dpldocs.info/this-week-in-d/Blog.Posted_2021_07_26.html#on-my-wish-list

I often wish there was a tuple of the function's arguments available. I call it __arguments. D already has something similar for the D-style variadics, but I'd like to see it for all functions.

---
void foo(int a, int b) {
     auto c = __arguments[0]; // same as int c = a;
     writeln(__arguments); // same as writeln(a, b);
}
---

It is such a little thing but it would make that kind of forwarding a lot easier.

I also wouldn't mind a __this_function thing, but that's fairly easy to hack around with __traits(parent, {}). And yah, you could kinda do some weird mixin thing with traits(parent) and pulling out the parameters tuple and mixing in the names. But much better to just have __arguments that just works.