gistfile1.txt

// var foo = bar = 42;
{
    "type": "Program",
    "body": [
        {
            "type": "VariableDeclaration",
            "declarations": [
                {
                    "type": "VariableDeclarator",
                    "id": {
                        "type": "Identifier",
                        "name": "foo"
                    },
                    "init": {
                        "type": "AssignmentExpression",
                        "operator": "=",
                        "left": {
                            "type": "Identifier",
                            "name": "bar"
                        },
                        "right": {
                            "type": "Literal",
                            "value": 42
                        }
                    }
                }
            ],
            "kind": "var"
        }
    ]
}