4 #![feature(staged_api)]
5 #![feature(const_trait_impl)]
6 #![stable(feature = "foo", since = "1.0.0")]
8 #[stable(feature = "potato", since = "1.27.0")]
13 #[stable(feature = "potato", since = "1.27.0")]
14 #[rustc_const_unstable(feature = "data_foo", issue = "none")]
15 impl const Default for Data {
16 fn default() -> Data {