omochimetaru

@swift-5.10.1 @swift-6.0.3 @swift-6.1-dev -swift-version 6

func withSpan<T>( isolation: isolated (any Actor)? = #isolation, _ operation: () async throws -> T ) async rethrows -> T { try await operation() }

exit status: 1 with

<stdin>:5:15: error: non-sendable type 'T' returned by implicitly asynchronous call to nonisolated function cannot cross actor boundary 1 | func withSpan<T>( | `- note: consider making generic parameter 'T' conform to the 'Sendable' protocol 2 | isolation: isolated (any Actor)? = #isolation, 3 | _ operation: () async throws -> T 4 | ) async rethrows -> T { 5 | try await operation() | `- error: non-sendable type 'T' returned by implicitly asynchronous call to nonisolated function cannot cross actor boundary 6 | } 7 |