warning: creating a mutable reference to mutable static is discouraged
  --> $DIR/borrowck-thread-local-static-mut-borrow-outlives-fn.rs:17:26
   |
LL |         S1 { a: unsafe { &mut X1 } }
   |                          ^^^^^^^ mutable reference to mutable static
   |
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>
   = note: mutable references to mutable statics are dangerous; it's undefined behavior if any other pointer to the static is used or if any other reference is created for the static while the mutable reference lives
   = note: `#[warn(static_mut_refs)]` on by default
help: use `&raw mut` instead to create a raw pointer
   |
LL |         S1 { a: unsafe { &raw mut X1 } }
   |                          ~~~~~~~~

warning: 1 warning emitted