error[E0381]: used binding `x` isn't initialized
  --> $DIR/move-of-addr-of-mut.rs:8:5
   |
LL |     let mut x: S;
   |         ----- binding declared here but left uninitialized
LL |     std::ptr::addr_of_mut!(x);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ `x` used here but it isn't initialized
   |
   = note: this error originates in the macro `std::ptr::addr_of_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
   |
LL |     let mut x: S = /* value */;
   |                  +++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0381`.