{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":")"}]}
) -> Result<&'tcx DefIdMap<ty::EarlyBinder<'tcx, Ty<'tcx>>>, ErrorGuaranteed> {
    impl_m_def_id: LocalDefId,
    let impl_m = tcx.opt_associated_item(impl_m_def_id.to_def_id()).unwrap();