ecmascript 0.2.0

A rust implementation of an ECMAScript parser
{
    "type": "Program",
    "body": [
        {
            "type": "ExpressionStatement",
            "expression": {
                "type": "SequenceExpression",
                "expressions": [
                    {
                        "type": "Identifier",
                        "name": "x",
                        "range": [
                            0,
                            1
                        ],
                        "loc": {
                            "start": {
                                "line": 1,
                                "column": 0
                            },
                            "end": {
                                "line": 1,
                                "column": 1
                            }
                        }
                    },
                    {
                        "type": "Identifier",
                        "name": "y",
                        "range": [
                            3,
                            4
                        ],
                        "loc": {
                            "start": {
                                "line": 1,
                                "column": 3
                            },
                            "end": {
                                "line": 1,
                                "column": 4
                            }
                        }
                    }
                ],
                "range": [
                    0,
                    4
                ],
                "loc": {
                    "start": {
                        "line": 1,
                        "column": 0
                    },
                    "end": {
                        "line": 1,
                        "column": 4
                    }
                }
            },
            "range": [
                0,
                4
            ],
            "loc": {
                "start": {
                    "line": 1,
                    "column": 0
                },
                "end": {
                    "line": 1,
                    "column": 4
                }
            }
        }
    ],
    "sourceType": "script",
    "tokens": [
        {
            "type": "Identifier",
            "value": "x",
            "range": [
                0,
                1
            ],
            "loc": {
                "start": {
                    "line": 1,
                    "column": 0
                },
                "end": {
                    "line": 1,
                    "column": 1
                }
            }
        },
        {
            "type": "Punctuator",
            "value": ",",
            "range": [
                1,
                2
            ],
            "loc": {
                "start": {
                    "line": 1,
                    "column": 1
                },
                "end": {
                    "line": 1,
                    "column": 2
                }
            }
        },
        {
            "type": "Identifier",
            "value": "y",
            "range": [
                3,
                4
            ],
            "loc": {
                "start": {
                    "line": 1,
                    "column": 3
                },
                "end": {
                    "line": 1,
                    "column": 4
                }
            }
        }
    ],
    "range": [
        0,
        4
    ],
    "loc": {
        "start": {
            "line": 1,
            "column": 0
        },
        "end": {
            "line": 1,
            "column": 4
        }
    }
}