Arbitrary := struct {
    field1 string
    field2 string
}{"a", "b"}

fmap := make(map[string]func(string) string)
fmap["fone"] = func(s string) { fmt.Printf("function fone: %s", s) }
fmap["ftwo"] = func(s string) { fmt.Printf("function ftwo: %s", s) }

// probably ok, as simple examples go, to this point where reflection needs to be used
Arbitrary.fone = fmap["fone"]

Arbitrary.fone("hello")