e5b9a42e37
core: document default attribute stabilization As of now, the first release which stabilized the `#[default]` macro for the deriving the `Default` trait for enus is not documented. I have had to search the [`RELEASES.md`](https://github.com/rust-lang/rust/blob/master/RELEASES.md) when making sure my code would be accepted by an older Rust compiler. I just added a line in the doc comment since, as far as I know, there's no option to pass to the `#[stable()]` attribute. I am open to improvements in the wording.
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