error[E0409]: variable `y` is bound in inconsistent ways within the same match arm
  --> $DIR/E0409.rs:5:23
   |
LL |         (0, ref y) | (y, 0) => {}
   |                 -     ^ bound in different ways
   |                 |
   |                 first binding

error[E0308]: mismatched types
  --> $DIR/E0409.rs:5:23
   |
LL |     match x {
   |           - this expression has type `({integer}, {integer})`
LL |         (0, ref y) | (y, 0) => {}
   |                       ^ expected `&{integer}`, found integer

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0308, E0409.
For more information about an error, try `rustc --explain E0308`.