{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//!"}]}
//!  - Add the cfg in [`disallow_cfgs`] to disallow users from setting it via `--cfg`
//!    so that the compiler can know the cfg is expected
//!  - Add the feature gating in `compiler/rustc_feature/src/builtin_attrs.rs`