error[E0502]: cannot borrow `x` as immutable because it is also borrowed as mutable
  --> $DIR/method-self-arg-2.rs:25:15
   |
LL |     let y = &mut x;
   |                  - mutable borrow occurs here
LL |     Foo::bar(&x); //~ERROR cannot borrow `x`
   |               ^ immutable borrow occurs here
...
LL | }
   | - mutable borrow ends here

error[E0499]: cannot borrow `x` as mutable more than once at a time
  --> $DIR/method-self-arg-2.rs:30:19
   |
LL |     let y = &mut x;
   |                  - first mutable borrow occurs here
LL |     Foo::baz(&mut x); //~ERROR cannot borrow `x`
   |                   ^ second mutable borrow occurs here
LL |     y.use_mut();
LL | }
   | - first borrow ends here

error: aborting due to 2 previous errors

Some errors occurred: E0499, E0502.
For more information about an error, try `rustc --explain E0499`.