error[E0370]: enum discriminant overflowed
  --> $DIR/E0370.rs:7:5
   |
LL |     Y,
   |     ^ overflowed on value after 9223372036854775807
   |
   = note: explicitly set `Y = -9223372036854775808` if that is desired outcome

error: aborting due to previous error

For more information about this error, try `rustc --explain E0370`.