error[E0425]: cannot find value `x` in this scope
  --> $DIR/macro-parameter-span.rs:11:9
   |
LL |         $id
   |         --- due to this macro variable
...
LL |         x
   |         ^ not found in this scope

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0425`.