Xcode code sense color/completion not working

In Xcode 4, I haven’t been able to find a “Rebuild Code Sense” button either, but if you go to Window -> Organizer, select the Project tab, and click “Delete…” next to the Derived Data folder, it seems to have the same effect. (I got that tip from http://blog.slidetorock.com/xcode-4-code-sense-autocompletion-problems, which indicates that it got it in turn from https://stackoverflow.com/questions/2138047/xcode-code-loses-syntax-coloring – but I don’t see it in any of the answers there. Very curious.)

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