Function - diverging example code does not compile at all on stable release channel

Link to page: https://doc.rust-lang.org/stable/rust-by-example/fn/diverging.html

Code in question:

#![feature(never_type)]

fn main() {
    let x: ! = panic!("This call never returns.");
    println!("You will never see this line!");
}

This results in the following error:

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> src/main.rs:1:1
  |
1 | #![feature(never_type)]
  | ^^^^^^^^^^^^^^^^^^^^^^^

I'm guessing this example was written before this limitation was introduced (or feature flag removed) from the stable channel? Or is it not meant to compile at all? Should it be removed?

Open the stable Rust by Example page at fn/diverging.html and run the displayed snippet on the stable release channel. Check the never_type feature requirement and determine whether the example should be revised or removed; done means the page no longer presents code that fails to compile on stable.