{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"}"}]}
                            } else if tcx.is_diagnostic_item(sym::Option, kind.did()) {
                                ("a", "Result", "Err", ret_ty_matches(sym::Result))
                                ("an", "Option", "None", ret_ty_matches(sym::Option))