fix uses_arguments handling (broken since 6605d1578351)

Using the symbol declaration tracking of UglifyJS doesn't make sense here
anyway, `arguments` always comes from something in the current scope.

fixes #1299

1 files changed, 8 insertions, 0 deletions

diff --git a/test/mocha/arguments.js b/test/mocha/arguments.js
index 089826fc..73993a73 100644
--- a/test/mocha/arguments.js
+++ b/test/mocha/arguments.js
@@ -19,4 +19,12 @@ describe("arguments", function() {
             value // Select function as scope
         );
     });
+
+    it("Should recognize when a function uses arguments", function() {
+        var ast = UglifyJS.parse("function a(){function b(){function c(){}; return arguments[0];}}");
+        ast.figure_out_scope();
+        assert.strictEqual(ast.body[0].uses_arguments, false);
+        assert.strictEqual(ast.body[0].body[0].uses_arguments, true);
+        assert.strictEqual(ast.body[0].body[0].body[0].uses_arguments, false);
+    });
 });
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