| 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 |    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 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 | 
 |  |