{"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"impl_m_def_id:"}]}
    impl_m_def_id: LocalDefId,
    tcx: TyCtxt<'tcx>,
) -> Result<&'tcx DefIdMap<ty::EarlyBinder<'tcx, Ty<'tcx>>>, ErrorGuaranteed> {