{"ast_node_type":"function","tokens":[{"end":98,"kind":"keyword","start":0,"text":"fn"}]}
    fn lint(&self, lint: &'static Lint, decorate: impl for<'a, 'b> FnOnce(&'b mut Diag<'a, ()>)) {
    #[rustc_lint_diagnostics]
        self.opt_span_lint(lint, None as Option<Span>, decorate);