error: attributes starting with `rustc` are reserved for use by the `rustc` compiler
  --> $DIR/reserved-attr-on-macro.rs:1:3
   |
LL | #[rustc_attribute_should_be_reserved]
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: cannot find attribute `rustc_attribute_should_be_reserved` in this scope
  --> $DIR/reserved-attr-on-macro.rs:1:3
   |
LL | #[rustc_attribute_should_be_reserved]
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors