tests/rustdoc-ui/lints/feature-gate-rustdoc_missing_doc_code_examples.rs

// compile-flags: -Zdeduplicate-diagnostics=yes
#![deny(unknown_lints)]
//~^ NOTE defined here
#![allow(rustdoc::missing_doc_code_examples)]
//~^ ERROR unknown lint
//~| NOTE lint is unstable
//~| NOTE see issue