contract convertible(_ To, f From) { To(f) } func FormatUnsigned(type T convertible(uint64, T))(v T) string { return strconv.FormatUint(uint64(v), 10) }contract convertible(_ To, f From) { To(f) } func FormatUnsigned(type T convertible(uint64, T))(v T) string { return strconv.FormatUint(uint64(v), 10) }