error: this attribute can only be applied at the crate level
  --> $DIR/doc_cfg_hide.rs:6:7
   |
LL | #[doc(cfg_hide(doc))]
   |       ^^^^^^^^^^^^^
   |
   = note: read <https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level> for more information
   = note: `#[deny(invalid_doc_attributes)]` on by default
help: to apply to the crate, use an inner attribute
   |
LL | #![doc(cfg_hide(doc))]
   |  +

error: `#[doc(cfg_hide(...))]` takes a list of attributes
  --> $DIR/doc_cfg_hide.rs:3:8
   |
LL | #![doc(cfg_hide = "test")]
   |        ^^^^^^^^^^^^^^^^^

error: `#[doc(cfg_hide(...))]` takes a list of attributes
  --> $DIR/doc_cfg_hide.rs:4:8
   |
LL | #![doc(cfg_hide)]
   |        ^^^^^^^^

error: aborting due to 3 previous errors