{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"result.map_err(|err|"}]}
    result.map_err(|err| match err {
    // (2)  Try to map the remaining inference vars back to generic params.
        OrphanCheckErr::UncoveredTyParams(UncoveredTyParams { uncovered, local_ty }) => {