{"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"for"}]}
    for (id_arg, arg) in
    let impl_generics = tcx.generics_of(impl_m.def_id);
        std::iter::zip(ty::GenericArgs::identity_for_item(tcx, impl_m.def_id), impl_m_args)