(Program
  (Module
    (Identifier))
  (Function
    (Identifier)
    (Args)
    (Switch
      (Case
        (Case
          (Other "expression_list"
            (RelationalOperator
            { (Identifier)
            ->(Identifier) }
            { (Identifier)
            ->(Identifier) })))
        (FunctionCall
          (Identifier)))
    {+(Case
        (Case
          (Other "expression_list"
            (RelationalOperator
              (Identifier)
              (Identifier))))
        (FunctionCall
          (Identifier)))+}
      (Case
        (Case
          (Other "expression_list"
            (RelationalOperator
            { (Identifier)
            ->(Identifier) }
            { (Identifier)
            ->(NumberLiteral) })))
        (FunctionCall
        { (Identifier)
        ->(Identifier) }))
    {-(Case
        (Case
          (Other "expression_list"
            (RelationalOperator
              (Identifier)
              (NumberLiteral))))
        (FunctionCall
          (Identifier)))-})))