error: this attribute can only be applied at the crate level
  --> $DIR/doc_cfg_hide.rs:9:7
   |
LL | #[doc(cfg_hide(doc))]
   |       ^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
   = note: read <https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level> for more information
note: the lint level is defined here
  --> $DIR/doc_cfg_hide.rs:2:9
   |
LL | #![deny(warnings)]
   |         ^^^^^^^^
   = note: `#[deny(invalid_doc_attributes)]` implied by `#[deny(warnings)]`
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:4:8
   |
LL | #![doc(cfg_hide = "test")]
   |        ^^^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>

error: `#[doc(cfg_hide(...)]` takes a list of attributes
  --> $DIR/doc_cfg_hide.rs:6:8
   |
LL | #![doc(cfg_hide)]
   |        ^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>

error: aborting due to 3 previous errors