{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"backend_repr:"}]}
            backend_repr: BackendRepr::Memory { sized: count_if_sized.is_some() },
            fields: FieldsShape::Array { stride: element.size, count },
            largest_niche: element.largest_niche.filter(|_| count != 0),