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swift-mirror/test/Concurrency/transfernonsendable_global_actor_serialization.swift

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Swift

// RUN: %target-swift-frontend -emit-module -emit-module-path %t/GlobalActorIsolatedFunction.swiftmodule -module-name GlobalActorIsolatedFunction -strict-concurrency=complete %S/Inputs/GlobalActorIsolatedFunction.swift
// RUN: %target-swift-frontend -emit-sil -swift-version 6 -disable-availability-checking -verify %s -o /dev/null -parse-as-library -I %t
// README: This is testing that we properly serialize ActorIsolation on
// SILFunctions. We do not print it yet on SILFunctions, but we can observe it
// behaviorally.
// REQUIRES: concurrency
// REQUIRES: asserts
import GlobalActorIsolatedFunction
func useValueAsync<T>(_ t: T) async {}
@MainActor func synchronousActorIsolatedFunctionError() async {
let erased: () -> Void = mainActorFunction
await useValueAsync(erased) // expected-error {{sending 'erased' risks causing data races}}
// expected-note @-1 {{sending main actor-isolated 'erased' to nonisolated global function 'useValueAsync' risks causing data races between nonisolated and main actor-isolated uses}}
}