Any suggestions ? \verbatim comes to mind as something unlikely to ever be robust in L2E. I suggest we switch the example to use that.
I'm surprised \raisebox was ever fragile. That doesn't make sense to me. I propose to change the example to some hand-made stuff like this (the If there was a simple way to construct a fragile command, that would be ok. But I don't think there is. More or less by definition, a fragile definition makes use of low-level stuff like changing catcodes or \futurelet, doesn't it? And we don't want to talk about those since they aren't part of LaTeX. -k