Turns out its commenting technique was completely broken—the attributes
have to be attached to an item *inside* the macro, not outside. And
judging by https://docs.rs/anymap/0.11.0/anymap/any/trait.CloneAny.html,
it was broken from the start, and I never noticed. Sigh. Now, you get a
warning that it’s not going to work like you want. Good stuff.
Well, that macro wasn’t a great idea anyway. Doing without it ends up a
little longer, and risks inconsistent editing, but is decidedly easier
to read.