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Rollup merge of #94457 - jhpratt:stabilize-derive_default_enum, r=davidtwco

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Stabilize `derive_default_enum`

This stabilizes `#![feature(derive_default_enum)]`, as proposed in [RFC 3107](https://github.com/rust-lang/rfcs/pull/3107) and tracked in #87517. In short, it permits you to `#[derive(Default)]` on `enum`s, indicating what the default should be by placing a `#[default]` attribute on the desired variant (which must be a unit variant in the interest of forward compatibility).

```````@rustbot``````` label +S-waiting-on-review +T-lang
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Dylan DPC 2022-04-15 20:50:43 +02:00 • committed by GitHub
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compiler/rustc_feature/src/active.rs
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@ -368,8 +368,6 @@ declare_features! (
(active, deprecated_safe, "1.61.0", Some(94978), None),
/// Allows having using `suggestion` in the `#[deprecated]` attribute.
(active, deprecated_suggestion, "1.61.0", Some(94785), None),
/// Allows `#[derive(Default)]` and `#[default]` on enums.
(active, derive_default_enum, "1.56.0", Some(86985), None),
/// Tells rustdoc to automatically generate `#[doc(cfg(...))]`.
(active, doc_auto_cfg, "1.58.0", Some(43781), None),
/// Allows `#[doc(cfg(...))]`.