error[E0502]: cannot borrow `p` as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-closures-mut-and-imm.rs:17:14
   |
LL |     let c2 = || p.y * 5;
   |              -- --- first borrow occurs due to use of `p.y` in closure
   |              |
   |              immutable borrow occurs here
LL |     let c1 = || {
   |              ^^ mutable borrow occurs here
LL |
LL |         dbg!(&p);
   |               - second borrow occurs due to use of `p` in closure
LL |         p.x = 4;
   |         --- capture is mutable because of use here
LL |     };
LL |     drop(c2);
   |          -- immutable borrow later used here

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0502`.