error: unknown lint: `rustdoc::missing_doc_code_examples`
  --> $DIR/feature-gate-rustdoc_missing_doc_code_examples.rs:4:10
   |
LL | #![allow(rustdoc::missing_doc_code_examples)]
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the `rustdoc::missing_doc_code_examples` lint is unstable
   = note: see issue #101730 <https://github.com/rust-lang/rust/issues/101730> for more information
   = help: add `#![feature(rustdoc_missing_doc_code_examples)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
note: the lint level is defined here
  --> $DIR/feature-gate-rustdoc_missing_doc_code_examples.rs:2:9
   |
LL | #![deny(unknown_lints)]
   |         ^^^^^^^^^^^^^

error: aborting due to 1 previous error