Testing failed: Expansion of macro 'PerceptionIgnored()' did not produce a observing accessor

[rehatkathuria]

 @PerceptionIgnored private var key: Window? { windows.first(where: { $0.isKeyWindow }) }

A test that uses an object which has the following declared is causing the test to fail

[rehatkathuria]

Where Window is a typealias for UIWindow and NSWindow respective of the platform

[mbrandonw]

Can you please provide some code that actually demonstrates the problem? It's difficult to provide help without that. Also computed properties don't need @PerceptionIgnored as they are not observable. Only stored properties are observable.