omochimetaru

@swift-6.1-dev -swift-version 6

final class Buffer { var a: Int = 0 } actor A { let c = C() func foo() async throws { let buffer = try await c.cool() print(buffer.a) } } final class C { var a: Int = 0 var b = Buffer() func cool() async throws -> Buffer { try await Task.sleep(for: .seconds(1)) return b } }

exit status: 1 with

<stdin>:9:34: error: non-sendable result type 'Buffer' cannot be sent from nonisolated context in call to instance method 'cool()' 1 | final class Buffer { | `- note: class 'Buffer' does not conform to the 'Sendable' protocol 2 | var a: Int = 0 3 | } : 7 | 8 | func foo() async throws { 9 | let buffer = try await c.cool() | `- error: non-sendable result type 'Buffer' cannot be sent from nonisolated context in call to instance method 'cool()' 10 | print(buffer.a) 11 | }