From: 046-301-5902@kylheku.com   
      
   On 2025-12-20, Tim Rentsch  wrote:   
   > identifiers).  Hence any other predefined macro name may be used,   
   > definedly, simply by using #undef and then #define for the macro   
   > name in question (in particular, under C23 rules, but not earlier   
   > versions of the C standard).   
      
   If that interpretation is accurate, it is a serious problem.   
      
   The implementation must be prepared for the situation that any of its   
   internal macros are undefined, or undefined and redefined.   
      
   That means that other macros cannot rely on those macros.   
   Some documented macro foo() cannot rely on a __foo_impl()   
   macro because the program could #undef that.   
      
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