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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
commit 27e2d811e6
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compiler/rustc_trait_selection/src/lib.rs
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@ -16,7 +16,7 @@
#![feature(box_patterns)]
#![feature(control_flow_enum)]
#![feature(crate_visibility_modifier)]
#![feature(derive_default_enum)]
#![cfg_attr(bootstrap, feature(derive_default_enum))]
#![feature(drain_filter)]
#![feature(hash_drain_filter)]
#![feature(label_break_value)]