error[E0505]: cannot move out of `a.x` because it is borrowed
  --> $DIR/borrowck-move-subcomponent.rs:25:14
   |
LL |   let pb = &a;
   |             - borrow of `a` occurs here
LL |   let S { x: ax } = a;  //~ ERROR cannot move out
   |              ^^ move out of `a.x` occurs here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0505`.