so, AsyncStream is not supposed to be Sendable, yet it compiles as if it were:
class C
{
var x:Int
init()
{
self.x = 0
}
}
actor A
{
init()
{
}
func foo(_ x:AsyncStream<Int>) async
{
for await y:Int in x
{
print(y)
}
}
func bar(_:C)
{
}
}
@main
enum Main
{
static
func main() async
{
let a:A = .init()
let c:C = .init()
let stream:AsyncStream<Int> = .init
{
(continuation:AsyncStream<Int>.Continuation) in
...
}
await a.foo(stream)
await a.bar(c)
}
}
$ swiftc -parse-as-library concurrency-boundaries.swift
concurrency-boundaries.swift:53:17: warning: cannot pass argument of non-sendable type 'C' across actors
await a.bar(c)
^
concurrency-boundaries.swift:1:7: note: class 'C' does not conform to the 'Sendable' protocol
class C
is this a bug, or intended behavior?