semantic/test/fixtures/javascript/comma-operator.parseB.txt

(Program
  (ExpressionStatements
    (Assignment
      (Identifier)
      (Object
        (Pair
          (Identifier)
          (CommaOperator
            (NumberLiteral)
            (MathOperator
              (NumberLiteral)
              (Other "+")
              (NumberLiteral))
            (NumberLiteral)))))))