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The latest version of this topic can be found at C28235.

warning C28235: The function cannot stand alone as an annotation

This warning indicates that an attempt was made to use a function that was not declared to be an annotation in an annotation context. This includes using a primitive operation (PrimOp) in a standalone context. This should not be possible if the standard macros are being used for annotations. This warning is not expected to be seen in typical use.