How to pass OwnedDisplayHandle to InstanceDescriptor display?

[max-kamps]

The documentation for InstanceDescriptor recommends passing an OwnedDisplayHandle as the display. However, it provides zero guidance on how to actually do that. I also wasn't able to find any examples that do this.

How do I convert the OwnedDisplayHandle into the required Box<dyn WgpuHasDisplayHandle>? Is this even possible with the latest version of raw_window_handle and winit, or is this outdated information? Am I missing something obvious?

The most obvious approach, Box::new(owned_display_handle) results in the following error:

(dyn raw_window_handle::HasDisplayHandle + 'static) cannot be sent between threads safely
the trait std::marker::Send is not implemented for (dyn raw_window_handle::HasDisplayHandle + 'static)
required for std::sync::Arc<(dyn raw_window_handle::HasDisplayHandle + 'static)> to implement std::marker::Send
required for winit::event_loop::OwnedDisplayHandle to implement wgpu::wgpu_types::WgpuHasDisplayHandle
required for the cast from std::boxed::Box<winit::event_loop::OwnedDisplayHandle> to std::boxed::Box<dyn wgpu::wgpu_types::WgpuHasDisplayHandle>

[kpreid]

It appears that you, or some intermediate code you are using, have constructed an Arc<dyn HasDisplayHandle>, which is not what winit provides nor what wgpu accepts. If possible, you should remove this Arc construction, and make sure you are constructing Box<OwnedDisplayHandle> (which will then coerce to Box<dyn WgpuHasDisplayHandle>.

If it is unclear how to do this, or this doesn’t seem to match what you have, please provide code of the functions you have written that work with display handles, and the versions of all involved dependencies, so we can understand the problem further.

If you know that, for some reason, you must have such an Arc, then changing the type of it from Arc<dyn HasDisplayHandle> to Arc<dyn HasDisplayHandle + Send + Sync> should work.

[max-kamps]

Thank you, Kevin! It appears this is because I am using winit 0.31.0-beta.2, the latest version on crates.io.
In that version of winit, OwnedDisplayHandle indeed contains an Arc<dyn HasDisplayHandle>

Looking at the master branch, it has been changed to containing an Arc<dyn HasDisplayHandle + Sync + Send> instead.

So I will probably switch from the beta to the latest git master. (Since I require some new 0.31 features)

To anyone finding this via search: Please consider winit 0.31.0-beta.1 and 0.31.0-beta.2 incompatible with wgpu and use a different version.