From: 643-408-1753@kylheku.com   
      
   On 2025-10-08, Keith Thompson  wrote:   
   > But in addition to that, in Kaz's example, n is not a constant   
   > expression, so `&(t.member-designator)` is not an address constant   
   > and therefore `offsetof(S, A[n])` has undefined behavior.   
      
   Great; I'd like to hear reasons to avoid it so I don't look foolish   
   for having overlooked it for manytyears. :)   
      
   > Every compiler I've tried handles this "correctly", and I tend to   
      
   I'm sure I've seen foo.bar expressions on the right of an offsetof,   
   but those still yield constants.   
      
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