Feature gate yield expressions not in 2024#132668
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I think this makes sense, r=me after addressing the comments
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#132651 (Remove attributes from generics in built-in derive macros) - rust-lang#132668 (Feature gate yield expressions not in 2024) - rust-lang#132771 (test(configure): cover `parse_args` in `src/bootstrap/configure.py`) - rust-lang#132895 (Generalize `NonNull::from_raw_parts` per ACP362) - rust-lang#132914 (Update grammar in std::cell docs.) - rust-lang#132927 (Consolidate type system const evaluation under `traits::evaluate_const`) - rust-lang#132935 (Make sure to ignore elided lifetimes when pointing at args for fulfillment errors) - rust-lang#132941 (Subtree update of `rust-analyzer`) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#132668 - ehuss:yield-gate-2024, r=davidtwco Feature gate yield expressions not in 2024 This changes it so that yield expressions are no longer allowed in the 2024 edition without a feature gate. We are currently only reserving the `gen` keyword in the 2024 edition, and not allowing anything else to be implicitly enabled by the edition. In practice this doesn't have a significant difference since yield expressions can't really be used outside of coroutines or gen blocks, which have their own feature gates. However, it does affect what is accepted pre-expansion, and I would feel more comfortable not allowing yield expressions. I believe the stabilization process for gen blocks or coroutines will not need to check the edition here, so this shouldn't ever be needed.
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This changes it so that yield expressions are no longer allowed in the 2024 edition without a feature gate. We are currently only reserving the
genkeyword in the 2024 edition, and not allowing anything else to be implicitly enabled by the edition.In practice this doesn't have a significant difference since yield expressions can't really be used outside of coroutines or gen blocks, which have their own feature gates. However, it does affect what is accepted pre-expansion, and I would feel more comfortable not allowing yield expressions.
I believe the stabilization process for gen blocks or coroutines will not need to check the edition here, so this shouldn't ever be needed.