So, User-Defined Attributes

[Philippe Sigaud]

Clojure uses its metadata (attached to values, though, not declaration) to
put documentation strings there.

That's quite doable with D:

@(doc("This function does.... "))
auto foo()
{ ... }

I'm also interested in tagging data:

@(Sorted!(withThisFun)) someRange ...
@(Ranged(0.0, 1.0)) someRange ...

or:

@Validated SQLQuery query;
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