error[E0658]: pattern bindings after an `@` are unstable
  --> $DIR/feature-gate-bindings_after_at.rs:2:13
   |
LL |     let x @ y = 0;
   |             ^
   |
   = note: see issue #65490 <https://github.com/rust-lang/rust/issues/65490> for more information
   = help: add `#![feature(bindings_after_at)]` to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.