error: found non-existing keyword `tadam` used in `#[doc(keyword = \"...\")]`
  --> $DIR/existing_doc_keyword.rs:10:1
   |
LL | #[doc(keyword = "tadam")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: only existing keywords are allowed in core/std
note: the lint level is defined here
  --> $DIR/existing_doc_keyword.rs:8:9
   |
LL | #![deny(rustc::existing_doc_keyword)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error