[SE-0362] Piecemeal adoption of upcoming language improvements #59055
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swiftlang/swift-driver#1118 @swift-ci please build toolchain |
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Introduce the `-enable-upcoming-feature X` command-line argument to allow one to opt into features that will be enabled in an upcoming language mode. Stage in several features this way (`ConciseMagicFile`, `ForwardTrailingClosures`, `BareSlashRegexLiterals`).
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When we encounter a check like `#if compiler(>=6.0) && something` or `#if swift(<6.0) || something`, and the left-hand term is a versioning check that determines the result of the whole condition, then we will not attempt to validate the right-hand term. This allows us to use versioned checks along with new discovery features (say, if we add an `#if attribute(x)`) without having to next conditions.
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Introduce a compiler flag
-enable-upcoming-feature X, which can be used to enable a feature in an earlier language mode (e..g, Swift 5.x) that will be enabled by default in an upcoming language mode (e.g., Swift 6). Available features can be detected with#if hasFeature(X).