--- /dev/null
+var UglifyJS = require('../../');
+var assert = require("assert");
+
+describe("arguments", function() {
+ it("Should known that arguments in functions are local scoped", function() {
+ var ast = UglifyJS.parse("var arguments; var f = function() {arguments.length}");
+ ast.figure_out_scope();
+
+ // Select symbol in function
+ var symbol = ast.body[1].definitions[0].value.find_variable("arguments");
+
+ assert.strictEqual(symbol.global, false);
+ assert.strictEqual(symbol.scope, ast. // From ast
+ body[1]. // Select 2nd statement (equals to `var f ...`)
+ definitions[0]. // First definition of selected statement
+ value // Select function as scope
+ );
+ });
+});
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