[GR-58239] Enforce that substitution target classes are static when they are inner classes. #9733
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@TargetClassannotated target classes must not be non-static inner classes, because the reference to the outer-class instance is a synthetic field in such inner classes and can cause problems.I also played around with disallowing inner classes completely, but that would be a too intrusive change. We have several inner target classes ourselfs, and external libraries might have them too. There is no need to break them.