(gcc.info) Subscripting

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 Non-Lvalue Arrays May Have Subscripts
 =====================================
 
    Subscripting is allowed on arrays that are not lvalues, even though
 the unary `&' operator is not.  For example, this is valid in GNU C
 though not valid in other C dialects:
 
      struct foo {int a[4];};
      
      struct foo f();
      
      bar (int index)
      {
        return f().a[index];
      }
 

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