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// RUN: %target-swift-frontend -emit-sil -strict-concurrency=complete -target %target-swift-5.1-abi-triple -verify %s -o /dev/null -swift-version 6
// REQUIRES: concurrency
// This test makes sure that all of our warnings are errors in swift6 mode.
////////////////////////
// MARK: Declarations //
////////////////////////
class NonSendableType {}
@MainActor func transferToMain<T>(_ t: T) async {}
func useValue<T>(_ t: T) {}
func transferValue<T>(_ t: sending T) {}
/////////////////
// MARK: Tests //
/////////////////
func testIsolationError() async {
let x = NonSendableType()
await transferToMain(x) // expected-error {{sending 'x' risks causing data races}}
// expected-note @-1 {{sending 'x' to main actor-isolated global function 'transferToMain' risks causing data races between main actor-isolated and local nonisolated uses}}
useValue(x) // expected-note {{access can happen concurrently}}
}
func testTransferArgumentError(_ x: NonSendableType) async {
await transferToMain(x) // expected-error {{sending 'x' risks causing data races}}
// expected-note @-1 {{sending task-isolated 'x' to main actor-isolated global function 'transferToMain' risks causing data races between main actor-isolated and task-isolated uses}}
}
func testPassArgumentAsTransferringParameter(_ x: NonSendableType) async {
transferValue(x) // expected-error {{sending 'x' risks causing data races}}
// expected-note @-1 {{task-isolated 'x' is passed as a 'sending' parameter; Uses in callee may race with later task-isolated uses}}
}
func testAssignmentIntoTransferringParameter(_ x: sending NonSendableType) async {
let y = NonSendableType()
await transferToMain(x)
x = y
useValue(y)
}
func testAssigningParameterIntoTransferringParameter(_ x: sending NonSendableType, _ y: NonSendableType) async {
x = y
}
func testIsolationCrossingDueToCapture() async {
let x = NonSendableType()
let _ = { @MainActor in
print(x) // expected-error {{sending 'x' risks causing data races}}
// expected-note @-1 {{'x' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses}}
}
useValue(x) // expected-note {{access can happen concurrently}}
}
func testIsolationCrossingDueToCaptureParameter(_ x: NonSendableType) async {
let _ = { @MainActor in
print(x) // expected-error {{sending 'x' risks causing data races}}
// expected-note @-1 {{task-isolated 'x' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses}}
}
useValue(x)
}
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