(Program
  (Module
    (Identifier))
  (Function
    (Identifier)
    (Args)
  {+(IndexExpression
      (Identifier)
      (NumberLiteral))+}
  {+(Slice
      (Identifier))+}
    (Slice
      {(Identifier)->(Identifier)}
      {(NumberLiteral)->(NumberLiteral)})
  {-(Slice
      (Identifier)
      (NumberLiteral))-}
  {-(Slice
      (Identifier)
      (NumberLiteral))-}
    (Slice
      (Identifier)
      (NumberLiteral)
      (NumberLiteral))
    (Slice
      (Identifier)
      (NumberLiteral)
      (NumberLiteral))
    (Slice
      (Identifier)
      (NumberLiteral)
      (NumberLiteral)
      (NumberLiteral))))