From: jameskuyper@alumni.caltech.edu   
      
   On 2025-11-29 19:29, Keith Thompson wrote:   
   > James Kuyper  writes:   
   > [...]   
   >> Note: in C2023, the predefined Identifiers section says: "Any other   
   >> predefined macro names: shall begin with a leading underscore followed   
   >> by an uppercase letter; or, a second underscore...". For earlier   
   >> versions of the standard, user code should avoid using such identifiers   
   >> because they were reserved for all purposes, but that's no longer the   
   >> case. Now, they should be avoided because they may be pre-defined by the   
   >> implementation, which means that any attempt to use them might have   
   >> unpredictable results.   
   >   
   > That's in the "Predefined macro names" section (N3220 6.10.10.1).   
   >   
   > The "Predefine identifiers" section (6.4.3.2) documents __func__.   
   > There are no other predefined identifiers.   
      
   Aagh! Sorry.   
      
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