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Rollup merge of #138081 - eholk:yield-feature, r=oli-obk

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Move `yield` expressions behind their own feature gate

In order to make progress with the `iter!` macro (e.g. in #137725), we need `yield` expressions to be available without the `coroutines` feature. This PR moves `yield` to be guarded by the `yield_expr` feature so that we can stabilize that independently (or at least, concurrently with the `iter_macro` feature). Note that once `yield` is stable, it will still be an error to use `yield` expressions outside something like a generator or coroutine, and these features remain unstable.

r? `@oli-obk`
This commit is contained in:
Michael Goulet 2025-03-06 15:40:05 -05:00 • committed by GitHub
commit bc45cdb27a
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9 changed files with 74 additions and 50 deletions
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compiler/rustc_feature/src/unstable.rs
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@ -670,6 +670,7 @@ declare_features! (
(unstable, xop_target_feature, "1.81.0", Some(127208)),
/// Allows `do yeet` expressions
(unstable, yeet_expr, "1.62.0", Some(96373)),
(unstable, yield_expr, "CURRENT_RUSTC_VERSION", Some(43122)),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!