{"ast_node_type":"function","tokens":[{"end":59,"kind":"keyword","start":0,"text":"fn"}]}
    fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, G>) {
impl<'a, G: EmissionGuarantee> rustc_errors::LintDiagnostic<'a, G> for Deprecated {
        diag.primary_message(match &self.since_kind {