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Rollup merge of #131034 - Urgau:cfg-true-false, r=nnethercote

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Implement RFC3695 Allow boolean literals as cfg predicates

This PR implements https://github.com/rust-lang/rfcs/pull/3695: allow boolean literals as cfg predicates, i.e. `cfg(true)` and `cfg(false)`.

r? `@nnethercote` *(or anyone with parser knowledge)*
cc `@clubby789`
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Guillaume Gomez 2024-10-04 15:42:53 +02:00 • committed by GitHub
commit 2ceeeb159d
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26 changed files with 284 additions and 58 deletions
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compiler/rustc_feature/src/unstable.rs
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@ -371,6 +371,8 @@ declare_features! (
(unstable, async_for_loop, "1.77.0", Some(118898)),
/// Allows using C-variadics.
(unstable, c_variadic, "1.34.0", Some(44930)),
/// Allows the use of `#[cfg(<true/false>)]`.
(unstable, cfg_boolean_literals, "CURRENT_RUSTC_VERSION", Some(131204)),
/// Allows the use of `#[cfg(overflow_checks)` to check if integer overflow behaviour.
(unstable, cfg_overflow_checks, "1.71.0", Some(111466)),
/// Provides the relocation model information as cfg entry