//     1.2.3.4: chain
				fallback := NewDestinationIP()
				fallback.Map["1.2.3.4"] = ToChain("chain")

				root := NewDestinationPort()
				root.OnNoMatch = ToMatcher(fallback.Matcher)
				return root
			},
			want: func() *matcher.Matcher {
				// root (dest ip):
				//   1.2.3.4: chain

				// fallback becomes root
				want := NewDestinationIP()
				want.Map["1.2.3.4"] = ToChain("chain")

					ExactMatchMap: &matcher.Matcher_MatcherTree_MatchMap{
						Map: m,
					},
				},
			},
		},
		OnNoMatch: nil,
	}
	return Mapper{Matcher: match, Map: m}
}

func NewDestinationIP() Mapper {
	return newMapper(DestinationIP)
}

func NewSourceIP() Mapper {
	return newMapper(SourceIP)
}

func NewDestinationPort() Mapper {
	return newMapper(DestinationPort)
}