babel/packages/babel-parser/test/fixtures/es2015/arrow-functions/invalid-rest-in-params/output.json

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  "errors": [
    "SyntaxError: Rest element must be last element. (3:13)",
    "SyntaxError: Unexpected trailing comma after rest element. (3:4)"
  ],
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          "type": "ArrowFunctionExpression",
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          "id": null,
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            {
              "type": "Identifier",
              "start":6,"end":11,"loc":{"start":{"line":2,"column":4,"index":6},"end":{"line":2,"column":9,"index":11},"identifierName":"first"},
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                "type": "Identifier",
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    "directives": []
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}