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@swift-main @swift-6.1-dev @swift-6.0.3 -swift-version 6 class NonSendable{} protocol P2 { subscript(_ a: sending NonSendable) -> sending NonSendable { get async } } @MainActor struct S: P2 { subscript(_ a: sending NonSendable) -> sending NonSendable { get async { a } } }
swift60 BOT 1/27/2025 11:00 AM
exit status: 1 with <stdin>:9:5: error: non-sendable type 'NonSendable' returned by main actor-isolated subscript 'subscript(_:)' satisfying protocol requirement cannot cross actor boundary 1 | class NonSendable{} | `- note: class 'NonSendable' does not conform to the 'Sendable' protocol 2 | 3 | protocol P2 { : 7 | @MainActor 8 | struct S: P2 { 9 | subscript(_ a: sending NonSendable) -> sending NonSendable { | `- error: non-sendable type 'NonSendable' returned by main actor-isolated subscript 'subscript(_:)' satisfying protocol requirement cannot cross actor boundary 10 | get async { a } 11 | }