Xcode 15.0: "expand macro" stays greyed out

Question

“Expand Macro” stays gray even though I’ve seen the @Observable macro expanding earlier.

However when I manually trigger build error it does expand the location of the error. In this case I target macOS 13.5 that doesn't support ObservationRegistrar.

I tried to restart Xcode, try different macros, different projects and types of projects.

Answer 1

I believe you are missing import Observation at the top of your file

I ran into the same issue as it is not so straight forward that all the @Observable macros "work" in code, they just cant be expanded without importing first. Seems like the compiler does not require the import, just Xcode.

Answer 2

@Observable is only available in

iOS 17.0+ iPadOS 17.0+ macOS 14.0+ Mac Catalyst 17.0+ tvOS 17.0+ watchOS 10.0+ visionOS 1.0+ Beta

You cannot use it for macOS 13.5. I don't think any of the macros work below macOS 14.