{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"(\"a\","}]}
                                ("a", "Result", "Err", ret_ty_matches(sym::Result))
                            if tcx.is_diagnostic_item(sym::Result, kind.did()) {
                            } else if tcx.is_diagnostic_item(sym::Option, kind.did()) {