code: def declarations(self):
          
          declarations = GetDeclarations()
          for a in self.constraints:
              try:
                  declarations.visit(a)
              except RuntimeError:
                  # TODO: (defunct) move recursion management out of PickleSerializer
                  if sys.getrecursionlimit() >= PickleSerializer.MAX_RECURSION:
                      raise Exception(f'declarations recursion limit surpassed {PickleSerializer.MAX_RECURSION}, aborting')
                  new_limit = sys.getrecursionlimit() + PickleSerializer.DEFAULT_RECURSION
                  if new_limit <= PickleSerializer.DEFAULT_RECURSION:
                      sys.setrecursionlimit(new_limit)
                      return self.declarations
          return declarations.result
docs: Returns the variable expressions of this constraint set