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1. swift-list-features: List Swift comp... swift-list-features: List Swift compiler upcoming and experimental feature flags. If you're using Swift 6.2 or later, `swift -print-supported-features` does something very similar, but only for the compiler version you have installed. · swift-has-feature: Check if a given compiler knows a specific feature flag, and whether it's an upcoming or experimental flag.

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   #!/bin/zsh

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   # Test if the Swift compiler knows about a particular language feature.

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   #

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   # Usage: