text: // Copyright (C) 2016 the V8 project authors. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  /*---
  es6id: 19.5.1
  description: Subclassing the Error object
  info: >
    19.5.1 The Error Constructor
  
    ...
    The Error constructor is designed to be subclassable. It may be used as the
    alue of an extends clause of a class definition. Subclass constructors that
    intend to inherit the specified Error behaviour must include a super call to
    the Error constructor to create and initialize subclass instances with a
    [[ErrorData]] internal slot.
  ---*/
  
  class CustomError extends Error {}
  
  var err = new CustomError('foo 42');
  
  assert.sameValue(err.message, 'foo 42');
  assert.sameValue(err.name, 'Error');
  