pub async fn add_default_route_for_mark<I: FidlRouteAdminIpExt + FidlRuleAdminIpExt + FidlRouteIpExt>(
route_table_provider: &<I::RouteTableProviderMarker as ProtocolMarker>::Proxy,
rule_set: &<I::RuleSetMarker as ProtocolMarker>::Proxy,
interface: &TestInterface<'_>,
next_hop: Option<SpecifiedAddr<I::Addr>>,
index: u32,
mark_1: MarkMatcher,
mark_2: MarkMatcher,
) -> <I::RouteSetMarker as ProtocolMarker>::Proxy