warning: creating a shared reference to mutable static is discouraged --> $DIR/safe-extern-statics-mut.rs:12:14 | LL | let rb = &B; | ^^ shared reference to mutable static | = note: for more information, see issue #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 | let rb = addr_of!(B); | ~~~~~~~~~~~ warning: creating a shared reference to mutable static is discouraged --> $DIR/safe-extern-statics-mut.rs:15:15 | LL | let xrb = &XB; | ^^^ shared reference to mutable static | = note: for more information, see issue #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 help: use `addr_of!` instead to create a raw pointer | LL | let xrb = addr_of!(XB); | ~~~~~~~~~~~~ error[E0133]: use of mutable static is unsafe and requires unsafe function or block --> $DIR/safe-extern-statics-mut.rs:11:13 | LL | let b = B; | ^ use of mutable static | = note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior error[E0133]: use of mutable static is unsafe and requires unsafe function or block --> $DIR/safe-extern-statics-mut.rs:12:15 | LL | let rb = &B; | ^ use of mutable static | = note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior error[E0133]: use of mutable static is unsafe and requires unsafe function or block --> $DIR/safe-extern-statics-mut.rs:14:14 | LL | let xb = XB; | ^^ use of mutable static | = note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior error[E0133]: use of mutable static is unsafe and requires unsafe function or block --> $DIR/safe-extern-statics-mut.rs:15:16 | LL | let xrb = &XB; | ^^ use of mutable static | = note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior error: aborting due to 4 previous errors; 2 warnings emitted For more information about this error, try `rustc --explain E0133`.