error[E0502]: cannot borrow `*x` as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-object-lifetime.rs:20:13
   |
LL |     let y = x.borrowed();
   |             ------------ immutable borrow occurs here
LL |     let z = x.mut_borrowed();
   |             ^^^^^^^^^^^^^^^^ mutable borrow occurs here
LL |     y.use_ref();
   |     ----------- immutable borrow later used here

error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-object-lifetime.rs:26:13
   |
LL |     let y = x.borrowed();
   |             ------------ immutable borrow occurs here
LL |     let z = &mut x;
   |             ^^^^^^ mutable borrow occurs here
LL |     y.use_ref();
   |     ----------- immutable borrow later used here

error: aborting due to 2 previous errors

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