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// RUN: %target-run-simple-swift(-Xfrontend -disable-availability-checking -swift-version 6)
// RUN: %target-run-simple-swift(-Xfrontend -disable-availability-checking -swift-version 6 -enable-upcoming-feature ImmutableWeakCaptures)
// REQUIRES: concurrency
// REQUIRES: executable_test
// REQUIRES: swift_feature_ImmutableWeakCaptures
// rdar://102155748
// UNSUPPORTED: back_deployment_runtime
func runIn10ms(_ closure: @escaping @Sendable () -> Void) {
Task {
try! await Task.sleep(nanoseconds: 10_000_000)
closure()
}
}
let checkInterval = 10_000_000
let checkIters = 1000
final class Weak: Sendable {
let property = "Self exists"
func test() async -> (Task<Void, Never>, Task<Void, Never>) {
let t1 = Task { [weak self] in
for _ in 0..<checkIters {
if let self {
// Use implicit self -- this should not result in a strong capture
_ = property
} else {
print("Self was captured weakly (1)")
return
}
try! await Task.sleep(nanoseconds: 10_000_000)
}
fatalError("Self was unexpectedly captured strongly")
}
let t2 = Task { [weak self] in
for _ in 0..<checkIters {
guard let self else {
print("Self was captured weakly (2)")
return
}
// Use implicit self -- this should not result in a strong capture
_ = property
runIn10ms { [self] in
// Use implicit self -- this should not result in a strong capture
_ = property
}
try! await Task.sleep(nanoseconds: 10_000_000)
}
fatalError("Self was unexpectedly captured strongly")
}
return (t1, t2)
}
}
let (t1, t2) = await Weak().test()
await t1.value
await t2.value
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