{"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"Some((Level::Expect,"}]}
                Some((Level::Expect, Some(unstable_id))) if let Some(hir_id) = source_hir_id => {
                // an attribute.
                    let LintExpectationId::Unstable { lint_index: None, attr_id: _ } = unstable_id