code: def start_handling_includes(self, t=None):
          
          d = self.dispatch_table
          p = self.stack[-1] if self.stack else self.default_table
  
          for k in ('import', 'include', 'include_next'):
              d[k] = p[k]
docs: Causes the PreProcessor object to start processing #import,
          #include and #include_next lines.
  
          This method will be called when a #if, #ifdef, #ifndef or #elif
          evaluates True, or when we reach the #else in a #if, #ifdef,
          #ifndef or #elif block where a condition already evaluated
          False.