text: /* Copyright JS Foundation and other contributors, http://js.foundation
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  function check_reference_error (code)
  {
    try {
      eval (code);
      assert (false);
    } catch (e) {
      assert (e instanceof ReferenceError);
    }
  }
  
  check_reference_error ("let b = a, a;");
  check_reference_error ("const b = b;");
  check_reference_error ("a; let b, a;");
  check_reference_error ("a = 1; let b, a;");
  
  function f() {
    return x + y.a;
  }
  
  check_reference_error ("x");
  check_reference_error ("y");
  check_reference_error ("x = 1");
  check_reference_error ("y = 1");
  
  let x = 6;
  assert (x === 6);
  let y = { a: 7 };
  assert (y.a === 7);
  
  assert (f() === 13);
  