MainActor + AsyncSequence

UsesAsyncSequence.swift

@MainActor
final class UsesAsyncSequence {
	func original() {
		let stream = AsyncStream { 42 }

		Task {
			// Passing argument of non-sendable type
			// 'inout AsyncStream<Int>.Iterator' outside of main
			// actor-isolated context may introduce data races
			for await value in stream {
				processValue(value)
			}
		}
	}

	func possibleFix() {
		let stream = AsyncStream {
			return 42
		}

		// explicitly remove the actor inheritance so the iterator does not need to hop
		// between MainActor and non-isolated
		Task.detached {
			for await value in stream {
				await self.processValue(value)
			}
		}
	}

	func processValue(_ value: Int) {}
}