`ref_as_ptr` example does not emit warnings

Summary

The example in https://rust-lang.github.io/rust-clippy/master/index.html#/ref_as_ptr does not emit any warnings for the lint.

Lint Name

ref_as_ptr

Reproducer

I tried this code:

#![warn(clippy::ref_as_ptr)]
fn main() {
  let a_ref = &1i32;
  let a_ptr = a_ref as *const _;
}

I expected to see this happen:
Since this is the example for what not to do, the lint should emit a warning here suggesting to use ptr::from_ref.

Instead, this happened:
No warnings.

Version

clippy commit befb659145a734e51a3708ff84315ae07123c880

Start with the ref_as_ptr lint entry point and its documentation example at the linked Clippy book page, then run the supplied Rust reproducer with the lint enabled. Compare the example with the lint's existing tests or diagnostics; done means the example triggers a warning recommending ptr::from_ref.