From: 643-408-1753@kylheku.com   
      
   Jonas Lund of https://whizzter.woorlic.org/ mentioned this   
   trick in a HackerNews comment:   
      
   Given:   
      
     struct S {   
       // ...   
       T A[];   
     };   
      
   Don't do this:   
      
     malloc(offsetof(S, A) + n * sizeof (T));   
      
   But rather this:   
      
     malloc(offsetof(S, A[n]));   
      
   It's easy to forget that the second argument of offsetof is a   
   designator, not simply a member name.   
      
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