error[E0596]: cannot borrow immutable argument `x` as mutable
  --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:63:24
   |
62 | fn deref_mut_field1(x: Own<Point>) {
   |                     - consider changing this to `mut x`
63 |     let __isize = &mut x.y; //~ ERROR cannot borrow
   |                        ^ cannot borrow mutably

error[E0596]: cannot borrow immutable borrowed content `*x` as mutable
  --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:75:10
   |
74 | fn deref_extend_mut_field1(x: &Own<Point>) -> &mut isize {
   |                               ----------- use `&mut Own<Point>` here to make mutable
75 |     &mut x.y //~ ERROR cannot borrow
   |          ^ cannot borrow as mutable

error[E0499]: cannot borrow `*x` as mutable more than once at a time
  --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:88:19
   |
87 |     let _x = &mut x.x;
   |                   - first mutable borrow occurs here
88 |     let _y = &mut x.y; //~ ERROR cannot borrow
   |                   ^ second mutable borrow occurs here
89 | }
   | - first borrow ends here

error[E0596]: cannot borrow immutable argument `x` as mutable
  --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:98:5
   |
97 | fn assign_field1<'a>(x: Own<Point>) {
   |                      - consider changing this to `mut x`
98 |     x.y = 3; //~ ERROR cannot borrow
   |     ^ cannot borrow mutably

error[E0596]: cannot borrow immutable borrowed content `*x` as mutable
   --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:102:5
    |
101 | fn assign_field2<'a>(x: &'a Own<Point>) {
    |                         -------------- use `&'a mut Own<Point>` here to make mutable
102 |     x.y = 3; //~ ERROR cannot borrow
    |     ^ cannot borrow as mutable

error[E0499]: cannot borrow `*x` as mutable more than once at a time
   --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:111:5
    |
110 |     let _p: &mut Point = &mut **x;
    |                                -- first mutable borrow occurs here
111 |     x.y = 3; //~ ERROR cannot borrow
    |     ^ second mutable borrow occurs here
112 | }
    | - first borrow ends here

error[E0596]: cannot borrow immutable argument `x` as mutable
   --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:119:5
    |
118 | fn deref_mut_method1(x: Own<Point>) {
    |                      - consider changing this to `mut x`
119 |     x.set(0, 0); //~ ERROR cannot borrow
    |     ^ cannot borrow mutably

error[E0596]: cannot borrow immutable borrowed content `*x` as mutable
   --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:131:5
    |
130 | fn deref_extend_mut_method1(x: &Own<Point>) -> &mut isize {
    |                                ----------- use `&mut Own<Point>` here to make mutable
131 |     x.y_mut() //~ ERROR cannot borrow
    |     ^ cannot borrow as mutable

error[E0596]: cannot borrow immutable argument `x` as mutable
   --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:139:6
    |
138 | fn assign_method1<'a>(x: Own<Point>) {
    |                       - consider changing this to `mut x`
139 |     *x.y_mut() = 3; //~ ERROR cannot borrow
    |      ^ cannot borrow mutably

error[E0596]: cannot borrow immutable borrowed content `*x` as mutable
   --> $DIR/borrowck-borrow-overloaded-auto-deref-mut.rs:143:6
    |
142 | fn assign_method2<'a>(x: &'a Own<Point>) {
    |                          -------------- use `&'a mut Own<Point>` here to make mutable
143 |     *x.y_mut() = 3; //~ ERROR cannot borrow
    |      ^ cannot borrow as mutable

error: aborting due to 10 previous errors

You've got a few errors: E0499, E0596
If you want more information on an error, try using "rustc --explain E0499"