`extern crate` dance appears to not be required any more?

[vext01]

The docs ask you to add this:

#[macro_use]
extern crate static_assertions;

However, when I did this, the compiler gave:

warning: unused `#[macro_use]` import
  --> ykrt/src/lib.rs:11:1
   |
11 | #[macro_use]
   | ^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

It seems to work just fine without.

I'm using:

rustc 1.75.0-nightly (1c05d50c8 2023-10-21)