kntk

@swift-6.1-dev @swift-main -swift-version 6 @MainActor func f() async { await f2 {} } func f2(a: () async -> Void) async { await a() }

exit status: 1 with

<stdin>:3:11: error: sending value of non-Sendable type '() async -> ()' risks causing data races 1 | @MainActor 2 | func f() async { 3 | await f2 {} | |- error: sending value of non-Sendable type '() async -> ()' risks causing data races | `- note: sending main actor-isolated value of non-Sendable type '() async -> ()' to nonisolated global function 'f2(a:)' risks causing races in between main actor-isolated and nonisolated uses 4 | } 5 | func f2(a: () async -> Void) async {