warning: creating a mutable reference to mutable static is discouraged
  --> $DIR/const_let_assign2.rs:18:24
   |
LL |     let ptr = unsafe { &mut BB };
   |                        ^^^^^^^ mutable 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 mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
   = note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
   |
LL |     let ptr = unsafe { addr_of_mut!(BB) };
   |                        ~~~~~~~~~~~~~  +

warning: 1 warning emitted