text: // Copyright (C) 2017 Valerie Young. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  description: TypeError when setting private field not in `this`'s [[PrivateFieldValues]]
  esid: sec-putvalue
  info: |
    PutValue ( V, W )
      ...
      5. Else if IsPropertyReference(V), then
        ...
        b. If IsPrivateReference(V), then
          i. Let env be the running execution context's PrivateNameEnvironment.
          ii. Let field be ? ResolveBinding(GetReferencedName(V), env).
          iii. Assert: field is a Private Name.
          iv. Perform ? PrivateFieldSet(field, base, W).
  
    PrivateFieldSet (P, O, value )
      1. Assert: P is a Private Name value.
      2. If O is not an object, throw a TypeError exception.
      3. Let entry be PrivateFieldFind(P, O).
      4. If entry is empty, throw a TypeError exception.
  
    PrivateFieldFind (P, O)
      1. Assert: P is a Private Name value.
      2. Assert: O is an object with a [[PrivateFieldValues]] internal slot.
      3. For each element entry in O.[[PrivateFieldValues]],
        a. If entry.[[PrivateName]] is P, return entry.
      4. Return empty.
  
  features: [class, class-fields-private]
  ---*/
  
  
  class Outer {
    #x = 42;
  
    innerclass() {
      var self = this;
  
      return class extends Outer {
        #x = 'not42';
        f() {
          self.#x = 1;
        }
      }
    }
  }
  
  var Inner = new Outer().innerclass();
  var i = new Inner();
  
  assert.throws(TypeError, function() {
    // when f() is called, the entry in the PrivateNameEnironment's environment
    // record for '#x' will contain the Inner class's Private Name for '#x'.
    // When this Private Name is used for lookup on the `self` object, it
    // will not be found (as the `self` object has the Outer's Private Name for #x)
    i.f();
  })
  