Can't use `implement` macro for `Application`

Problem

I am trying to use the implement macro to implement a subclass of Microsoft::UI::Xaml::Application. It produces a build error

error[E0599]: no function or associated item named `new` found for struct `windows_app::Microsoft::UI::Xaml::IApplication_Vtbl` in the current scope
error[E0599]: no function or associated item named `matches` found for struct `windows_app::Microsoft::UI::Xaml::IApplication_Vtbl` in the current scope

I think this is dependent on #37, which ran into a few snags. @riverar

Sorry to keep you waiting, missed this issue.

Earlier versions of the windows-app crate didn't emit the implement feature (or bring in the upstream windows implement feature). #37 does but I'll pull that out and merge it separately today. Standby.

@ZoeyR Give that a spin. Let me know if you run into any other issues. There's a new sample too that may be helpful.

windows-app-rs/crates/samples/xamlapp/src/main.rs

Lines 38 to 56 in 8bb7a82

    
           #[implement(IApplicationOverrides)] 
        
           struct App { 
        
               _window: RefCell<Option<Window>>, 
        
           } 
        
           #[allow(non_snake_case)] 
        
           impl App { 
        
               fn new() -> windows::core::Result<App> { 
        
                   let app = App { 
        
                       _window: RefCell::new(None), 
        
                   }; 
        
                   Ok(app) 
        
               } 
        
           } 
        
           impl IApplicationOverrides_Impl for App { 
        
               fn OnLaunched(&self, _: &Option<LaunchActivatedEventArgs>) -> windows::core::Result<()> { 
        
                   let window = Window::new()?; 
        
                   window.SetTitle("WinUI 3 Desktop, Unpackaged (Rust)")?;

	#[implement(IApplicationOverrides)]
	struct App {
	_window: RefCell<Option<Window>>,
	}

	#[allow(non_snake_case)]
	impl App {
	fn new() -> windows::core::Result<App> {
	let app = App {
	_window: RefCell::new(None),
	};
	Ok(app)
	}
	}

	impl IApplicationOverrides_Impl for App {
	fn OnLaunched(&self, _: &Option<LaunchActivatedEventArgs>) -> windows::core::Result<()> {
	let window = Window::new()?;
	window.SetTitle("WinUI 3 Desktop, Unpackaged (Rust)")?;