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Auto merge of #86735 - jhpratt:rfc-3107, r=petrochenkov

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Implement RFC 3107: `#[derive(Default)]` on enums with a `#[default]` attribute

This PR implements RFC 3107, which permits `#[derive(Default)]` on enums where a unit variant has a `#[default]` attribute. See comments for current status.
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bors 2021-07-28 05:59:30 +00:00
commit aea2e446f0
14 changed files with 511 additions and 76 deletions
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3
compiler/rustc_feature/src/active.rs
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@ -677,6 +677,9 @@ declare_features! (
/// Infer generic args for both consts and types.
(active, generic_arg_infer, "1.55.0", Some(85077), None),
/// Allows `#[derive(Default)]` and `#[default]` on enums.
(active, derive_default_enum, "1.56.0", Some(86985), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------