with this test program,
@main
enum Main
{
static
func main() async
{
do
{
async
let a:Void = Self.test("A")
async
let b:Void = Self.test("B")
async
let c:Void = Self.test("C")
print("cancel")
}
}
}
i would expect all three tasks to be cancelled on scope exit, and then implicitly awaited on, as if
static
func main() async
{
do
{
async
let a:Void = Self.test("A")
async
let b:Void = Self.test("B")
async
let c:Void = Self.test("C")
print("cancel")
c.cancel()
b.cancel()
a.cancel()
await c
await b
await a
}
}
but instead, it looks like async let does
static
func main() async
{
do
{
async
let a:Void = Self.test("A")
async
let b:Void = Self.test("B")
async
let c:Void = Self.test("C")
print("cancel")
c.cancel()
await c
b.cancel()
await b
a.cancel()
await a
}
}
this the test function i am using:
static
func test(_ name:String) async
{
do
{
print("\(name): started")
try await Task.sleep(for: .seconds(2))
print("\(name): not cancelled")
}
catch
{
print("\(name): cancelled")
}
let delay:Task<Void, Never> = .init
{
try? await Task.sleep(for: .seconds(2))
}
await delay.value
print("\(name): completed")
}
and the output i am getting:
cancel
B: started
A: started
C: started
C: cancelled
A: not cancelled
B: not cancelled
C: completed
A: completed
B: completed
is this intended behavior?