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1dd975beb3
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.