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Auto merge of #84571 - jedel1043:issue-49804-impl, r=petrochenkov

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Parse unnamed fields of struct and union type

Added the `unnamed_fields` feature gate.

This is a prototype of [RFC 2102](https://github.com/rust-lang/rust/issues/49804), so any suggestions are greatly appreciated.

r? `@petrochenkov`
This commit is contained in:
bors 2021-05-17 12:15:26 +00:00
commit 9964284fed
19 changed files with 707 additions and 112 deletions
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4
compiler/rustc_feature/src/active.rs
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@ -671,6 +671,9 @@ declare_features! (
/// Allows specifying the as-needed link modifier
(active, native_link_modifiers_as_needed, "1.53.0", Some(81490), None),
/// Allows unnamed fields of struct and union type
(active, unnamed_fields, "1.53.0", Some(49804), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------
@ -704,6 +707,7 @@ pub const INCOMPLETE_FEATURES: &[Symbol] = &[
sym::native_link_modifiers_whole_archive,
sym::native_link_modifiers_as_needed,
sym::rustc_insignificant_dtor,
sym::unnamed_fields,
];
/// Some features are not allowed to be used together at the same time, if