IAsyncOperation<T> no longer Send for some T as of v0.29

[qdot]

Just updated to v0.29, tried to compile https://github.com/deviceplug/btleplug with no code changes otherwise, and I'm getting a bunch of errors about IAsyncOperations no longer working due to not implementing Send. v0.28 worked fine.

error: future cannot be sent between threads safely
  --> src\winrtble\manager.rs:34:54
   |
34 |       async fn adapters(&self) -> Result<Vec<Adapter>> {
   |  ______________________________________________________^
35 | |         let adapter_result = BluetoothAdapter::GetDefaultAsync().unwrap().await;
36 | |         let adapter = adapter_result.unwrap();
37 | |         info!("Adapter ID: {:?}", adapter.DeviceId());
...  |
48 | |         return Ok(result);
49 | |     }
   | |_____^ future created by async block is not `Send`
   |
   = help: within `impl futures::Future`, the trait `std::marker::Send` is not implemented for `NonNull<c_void>`
note: future is not `Send` as it awaits another future which is not `Send`
  --> src\winrtble\manager.rs:35:30
   |
35 |         let adapter_result = BluetoothAdapter::GetDefaultAsync().unwrap().await;
   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ await occurs here on type `IAsyncOperation<BluetoothAdapter>`, which is not `Send`
   = note: required for the cast to the object type `dyn futures::Future<Output = std::result::Result<Vec<Adapter>, Error>> + std::marker::Send`

error: future cannot be sent between threads safely
   --> src\winrtble\peripheral.rs:355:43
    |
355 |       async fn connect(&self) -> Result<()> {
    |  ___________________________________________^
356 | |         let shared_clone = Arc::downgrade(&self.shared);
357 | |         let adapter_clone = self.shared.adapter.clone();
358 | |         let address = self.shared.address;
...   |
380 | |         Ok(())
381 | |     }
    | |_____^ future created by async block is not `Send`
    |
    = help: within `impl futures::Future`, the trait `std::marker::Send` is not implemented for `NonNull<c_void>`
note: future is not `Send` as it awaits another future which is not `Send`
   --> src\winrtble\ble\device.rs:71:30
    |
71  |         let service_result = async_op.await.map_err(winrt_error)?;
    |                              ^^^^^^^^ await occurs here on type `IAsyncOperation<GattDeviceServicesResult>`, which is not `Send`
    = note: required for the cast to the object type `dyn futures::Future<Output = std::result::Result<(), Error>> + std::marker::Send`

error: future cannot be sent between threads safely
   --> src\winrtble\peripheral.rs:392:53
    |
392 |       async fn discover_services(&self) -> Result<()> {
    |  _____________________________________________________^
393 | |         let device = self.shared.device.lock().await;
394 | |         if let Some(ref device) = *device {
395 | |             let gatt_services = device.discover_services().await?;
...   |
422 | |         Err(Error::NotConnected)
423 | |     }
    | |_____^ future created by async block is not `Send`
    |
    = help: within `impl futures::Future`, the trait `std::marker::Send` is not implemented for `NonNull<c_void>`
note: future is not `Send` as it awaits another future which is not `Send`
   --> src\winrtble\ble\device.rs:71:30
    |
71  |         let service_result = async_op.await.map_err(winrt_error)?;
    |                              ^^^^^^^^ await occurs here on type `IAsyncOperation<GattDeviceServicesResult>`, which is not `Send`
    = note: required for the cast to the object type `dyn futures::Future<Output = std::result::Result<(), Error>> + std::marker::Send`

[kennykerr]

I thought there were tests for this - will get it fixed asap.

[kennykerr]

Sorry for the delay! This fix is included with #1423