I'm also seeing it. No VM; Xcode 16.0 beta 6. I believe this started after installing macOS Sequoia 15.0 beta 8 (24A5331b).
glhaynes79
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Looks like it can be found here https://github.com/DougGregor/swift-macro-examples/blob/main/MacroExamplesPlugin/CaseDetectionMacro.swift