Swift 5 to Swift 6 ```Unknown attribute 'retroactive'``` is there a release for Swift 5

[ljunquera]

I am getting Unknown attribute 'retroactive' errors in my Swift app because a package I am using has a dependency on this repository:

    dependencies: [
        .package(
            url: "https://github.com/valpackett/SwiftCBOR.git",
            .exact("0.4.7")
        )
    ]

I believe this is because I am using Swift 5, but I am not yet ready to move to Swift 6. I see the reference is for version 0.4.7 but could not find any releases. Is there release I can use which supports Swift 5?

[Oliver-Binns]

@ljunquera could you upgrade your tools version to Swift 6 but then set the Swift 5 language mode for your code that isn't ready to be upgraded?

In your package this would be:

let package = Package(
    name: "PackageName",
    // ... the rest of the package description
    swiftLanguageModes: [.v5]
)

or for a specific target:

targets: [
  .target(
    name: "TargetName",
    swiftSettings: [.swiftLanguageMode(.v5)]
  )
]

or in Xcode: