sref3 as *const i32 as *mut i32; in chapter 6.6 doesn't work for stable

[skorobogatydmitry]

I's going through the examples for shared references here and found that replacing let ptr4 = sref3 as *mut i32; with let ptr4 = sref3 as *const i32 as *mut i32; doesn't work even without miri on

stable-x86_64-unknown-linux-gnu (default)
rustc 1.75.0 (82e1608df 2023-12-21)

cargo run gives the following:

error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`

I'm not sure if I just messed-up something locally or it's a new stable safety feature.