shiz

@swift-main @swift-6.1-dev

class NonSendable{} protocol P { subscript(_: sending NonSendable) -> Bool { get } } @MainActor struct S: P { subscript(_: sending NonSendable) -> Bool { true } }

(edited)

<stdin>:9:5: warning: main actor-isolated subscript 'subscript(_:)' cannot be used to satisfy nonisolated protocol requirement; this is an error in the Swift 6 language mode 2 | 3 | protocol P { 4 | subscript(_: sending NonSendable) -> Bool { get } | `- note: 'subscript(_:)' declared here 5 | } 6 | 7 | @MainActor 8 | struct S: P { | `- note: add '@preconcurrency' to the 'P' conformance to defer isolation checking to run time 9 | subscript(_: sending NonSendable) -> Bool { true } | |- warning: main actor-isolated subscript 'subscript(_:)' cannot be used to satisfy nonisolated protocol requirement; this is an error in the Swift 6 language mode | `- note: add 'nonisolated' to 'subscript(_:)' to make this subscript not isolated to the actor 10 | } 11 |

(edited)