Test262 test for failing test ch10\10.6\10.6-6-3 and ch10\10.6\10.6-6-4 in UglifyJS2

arguments.length.js

var UglifyJS = require('uglify-js'); // or require("./tools/node");
var ast = UglifyJS.parse("var arguments; var f = function() {arguments.length}");
ast.figure_out_scope();
if (ast.body[1].definitions[0].value.find_variable("arguments").scope === ast.body[1].definitions[0].value) {
    console.log("TEST PASSED");
} else {
    console.log("TEST FAILED");
};