syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"#[cfg_attr(feature"}]}
source_snippet: #[cfg_attr(feature = "nightly", rustc_diagnostic_item = "IrTyKind")]
context_before: /// converted to this representation using `<dyn HirTyLowerer>::lower_ty`.
context_after: #[derive_where(Clone, Copy, Hash, PartialEq, Eq; I: Interner)]