error[E0506]: cannot assign to `x` because it is borrowed
  --> $DIR/issue-54556-wrap-it-up.rs:27:5
   |
LL |     let wrap = Wrap { p: &mut x };
   |                               - borrow of `x` occurs here
...
LL |     x = 1; //~ ERROR cannot assign to `x` because it is borrowed [E0506]
   |     ^^^^^ assignment to borrowed `x` occurs here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0506`.