error: removing an expression is not supported in this position
  --> $DIR/attr-empty-expr.rs:8:13
   |
LL |     let _ = #[test] 0;
   |             ^^^^^^^

error: removing an expression is not supported in this position
  --> $DIR/attr-empty-expr.rs:9:13
   |
LL |     let _ = #[bench] 1;
   |             ^^^^^^^^

error: removing an expression is not supported in this position
  --> $DIR/attr-empty-expr.rs:10:13
   |
LL |     let _ = #[test_case] 2;
   |             ^^^^^^^^^^^^

error: aborting due to 3 previous errors