Ole Begemann • 2/29/2024

How the Swift compiler knows that DispatchQueue.main implies @MainActor

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This technical article delves into the undocumented Swift compiler behavior that automatically treats closures in `DispatchQueue.main.async` calls as `@MainActor` isolated. It reveals the implementation is a syntax-based check for the literal `DispatchQueue.main` spelling, explores edge cases, and discusses the compiler source code location where this concurrency adjustment happens.

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#compiler #concurrency #Swift
How the Swift compiler knows that DispatchQueue.main implies @MainActor

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