warning: creating a shared reference to mutable static is discouraged
  --> $DIR/issue-15261.rs:9:37
   |
LL | static n: &'static usize = unsafe { &n_mut };
   |                                     ^^^^^^ shared reference to mutable static
   |
   = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
   = note: this will be a hard error in the 2024 edition
   = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
   = note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of!` instead to create a raw pointer
   |
LL | static n: &'static usize = unsafe { addr_of!(n_mut) };
   |                                     ~~~~~~~~~     +

warning: 1 warning emitted