add traceur test suite

test/fixtures/traceur/Destructuring/NestedScopeArguments.js

@@ -0,0 +1,11 @@
+// Destructuring bind alpha-renames 'arguments'; this ensures that
+// renaming doesn't rename in nested scopes.
+function destructNestedScopeArguments(x) {
+  [(function () { return arguments[1]; })(null, x)[0]] = [42];
+}
+
+// ----------------------------------------------------------------------------
+
+var result = [];
+destructNestedScopeArguments(result);
+assert.equal(42, result[0]);