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Rollup merge of #112790 - WaffleLapkin:syntactically, r=Nilstrieb

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Syntactically accept `become` expressions (explicit tail calls experiment)

This adds `ast::ExprKind::Become`, implements parsing and properly gates the feature.

cc `@scottmcm`
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Nilstrieb 2023-06-21 07:37:02 +02:00 • committed by GitHub
commit c6710d15f1
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17 changed files with 74 additions and 2 deletions
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compiler/rustc_feature/src/active.rs
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@ -395,6 +395,8 @@ declare_features! (
(active, exclusive_range_pattern, "1.11.0", Some(37854), None),
/// Allows exhaustive pattern matching on types that contain uninhabited types.
(active, exhaustive_patterns, "1.13.0", Some(51085), None),
/// Allows explicit tail calls via `become` expression.
(incomplete, explicit_tail_calls, "CURRENT_RUSTC_VERSION", Some(112788), None),
/// Allows using `efiapi`, `sysv64` and `win64` as calling convention
/// for functions with varargs.
(active, extended_varargs_abi_support, "1.65.0", Some(100189), None),