error: `limit` must be a non-negative integer --> $DIR/empty.rs:3:1 | LL | #![recursion_limit = ""] | ^^^^^^^^^^^^^^^^^^^^^--^ | | | `limit` must be a non-negative integer error: `limit` must be a non-negative integer --> $DIR/empty.rs:3:1 | LL | #![recursion_limit = ""] | ^^^^^^^^^^^^^^^^^^^^^--^ | | | `limit` must be a non-negative integer error: aborting due to 2 previous errors