error: left-hand side of `@` must be a binding
  --> $DIR/intersection-patterns-2.rs:13:9
   |
LL |         Some(x) @ Some(y) => {}
   |         -------^^^-------
   |         |         |
   |         |         also a pattern
   |         interpreted as a pattern, not a binding
   |
   = note: bindings are `x`, `mut x`, `ref x`, and `ref mut x`

error: aborting due to 1 previous error