error[E0499]: cannot borrow `p` as mutable more than once at a time
  --> $DIR/borrowck-1.rs:12:17
   |
LL |     let y = &mut p.y;
   |             -------- first mutable borrow occurs here
LL |     let mut c = || {
   |                 ^^ second mutable borrow occurs here
LL |
LL |        let x = &mut p.x;
   |                     --- capture is mutable because of use here
LL |        println!("{:?}", p);
   |                         - second borrow occurs due to use of `p` in closure
...
LL |     *y+=1;
   |     ----- first borrow later used here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0499`.