error[E0492]: statics cannot refer to interior mutable data
  --> $DIR/refs-to-cell-in-final.rs:13:54
   |
LL | static RAW_SYNC_S: SyncPtr<Cell<i32>> = SyncPtr { x: &Cell::new(42) };
   |                                                      ^^^^^^^^^^^^^^ this borrow of an interior mutable value may end up in the final value
   |
   = help: to fix this, the value can be extracted to a separate `static` item and then referenced

error[E0492]: constants cannot refer to interior mutable data
  --> $DIR/refs-to-cell-in-final.rs:15:53
   |
LL | const RAW_SYNC_C: SyncPtr<Cell<i32>> = SyncPtr { x: &Cell::new(42) };
   |                                                     ^^^^^^^^^^^^^^ this borrow of an interior mutable value may end up in the final value

warning: encountered mutable pointer in final value of constant
  --> $DIR/refs-to-cell-in-final.rs:30:1
   |
LL | const UNDEFINED: &JsValue = &JsValue::Undefined;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #122153 <https://github.com/rust-lang/rust/issues/122153>
   = note: `#[warn(const_eval_mutable_ptr_in_final_value)]` on by default

error: aborting due to 2 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0492`.
Future incompatibility report: Future breakage diagnostic:
warning: encountered mutable pointer in final value of constant
  --> $DIR/refs-to-cell-in-final.rs:30:1
   |
LL | const UNDEFINED: &JsValue = &JsValue::Undefined;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #122153 <https://github.com/rust-lang/rust/issues/122153>
   = note: `#[warn(const_eval_mutable_ptr_in_final_value)]` on by default