<ul><li>Calling certain code in a MainActor class or function crashes when building with Swift 6.</li><li>The crash occurs due to dynamic actor isolation enforcement from non-strict-concurrency contexts.</li><li>The issue arises when using Objective-C code in Swift, as the Swift compiler and runtime cannot prove its safety.</li><li>Swift 6 mode proactively crashes the app to prevent data races and encourages transitioning by carefully annotating the code.</li></ul>

Swift Concurrency and Objective-C

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