Code

static mut COUNTER: u32 = 0;

unsafe fn add_to_count(inc: u32) {
    unsafe {
        COUNTER += inc;
    }
}

fn main() {
    unsafe {
        add_to_count(3);
        println!("COUNTER: {}", COUNTER);
    }
}

Current output

error: creating a shared reference to mutable static is discouraged

Desired output

error: creating a shared reference to mutable static is not allowed

Rationale and extra context

Edition 2021 warning "warning: creating a shared reference to mutable static is discouraged" has become edition 2024 error "error: creating a shared reference to mutable static is discouraged", which is wrong.
That behaviour is no longer discouraged but it is now not allowed.

Other cases

Rust Version

rustc 1.86.0, edition 2024.

Anything else?

No response