error[E0502]: cannot borrow `y` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-anon-fields-struct.rs:23:19
   |
LL |         Y(ref mut a, _) => a
   |           --------- mutable borrow occurs here
...
LL |     let b = match y {
   |                   ^ immutable borrow occurs here
...
LL |     *a += 1;
   |     ------- borrow later used here

error[E0502]: cannot borrow `y` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-anon-fields-struct.rs:38:19
   |
LL |         Y(ref mut a, _) => a
   |           --------- mutable borrow occurs here
...
LL |     let b = match y {
   |                   ^ immutable borrow occurs here
...
LL |     *a += 1;
   |     ------- borrow later used here

error[E0499]: cannot borrow `y.0` as mutable more than once at a time
  --> $DIR/borrowck-anon-fields-struct.rs:39:11
   |
LL |         Y(ref mut a, _) => a
   |           --------- first mutable borrow occurs here
...
LL |         Y(ref mut b, _) => b //~ ERROR cannot borrow
   |           ^^^^^^^^^ second mutable borrow occurs here
...
LL |     *a += 1;
   |     ------- borrow later used here

error: aborting due to 3 previous errors

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