warning: creating a shared reference to mutable static is discouraged
  --> $DIR/issue-39367.rs:22:13
   |
LL | /             ONCE.call_once(|| {
LL | |
LL | |                 DATA = transmute
LL | |                     ::<Box<ArenaSet<Vec<u8>>>, *const ArenaSet<Vec<u8>>>
LL | |                     (Box::new(__static_ref_initialize()));
LL | |             });
   | |______________^ shared reference to mutable static
   |
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>
   = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
   = note: `#[warn(static_mut_refs)]` on by default

warning: 1 warning emitted