error[E0658]: `#[doc(include)]` is experimental
  --> $DIR/feature-gate-external_doc.rs:1:1
   |
LL | #[doc(include="asdf.md")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #44732 <https://github.com/rust-lang/rust/issues/44732> for more information
   = help: add `#![feature(external_doc)]` to the crate attributes to enable

error[E0658]: `#[doc(include)]` is experimental
  --> $DIR/feature-gate-external_doc.rs:1:1
   |
LL | #[doc(include="asdf.md")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #44732 <https://github.com/rust-lang/rust/issues/44732> for more information
   = help: add `#![feature(external_doc)]` to the crate attributes to enable

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.