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The Swift 6.5 nightly compiler warns when a versioned `#if canImport(Module, _version:)` names a module it cannot find (CanImportMissingModule). CI builds with -warnings-as-errors, so the four CryptoKit version checks in CryptoWrappers.swift failed the Linux nightly-main jobs, where CryptoKit does not exist. Follow the documented remedy: check that the module can be imported at all before checking its version. The directive still evaluates to false on Linux, so the SwiftCrypto fallback path is unchanged, and older compilers accept the combined condition.
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The nightly-main compiler warns on
#if canImport(CryptoKit, _version:)where CryptoKit does not exist (CanImportMissingModule), and-warnings-as-errorsmakes that fatal on Linux. Introduced by #197.canImport(CryptoKit) &&, the remedy from the compiler's diagnostic docs.swiftlang/swift:nightly-main-jammy:ci-linux.shand the static SDK build pass with the fix and fail without it.