error: `#[doc(keyword = "...")]` can only be used on empty modules
  --> $DIR/doc_keyword.rs:6:7
   |
LL | #[doc(keyword = "hell")]
   |       ^^^^^^^^^^^^^^^^

error: `#[doc(keyword = "...")]` can only be used on modules
  --> $DIR/doc_keyword.rs:11:7
   |
LL | #[doc(keyword = "hall")]
   |       ^^^^^^^^^^^^^^^^

error: `#![doc(keyword = "...")]` isn't allowed as a crate-level attribute
  --> $DIR/doc_keyword.rs:4:8
   |
LL | #![doc(keyword = "hello")]
   |        ^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors