text: // Copyright (C) 2020 Alexey Shvayka. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  esid: sec-proxy-object-internal-methods-and-internal-slots-set-p-v-receiver
  description: >
    If "set" trap is null or undefined, [[Set]] call is properly
    forwarded to [[ProxyTarget]] (which is also a Proxy object).
  info: |
    [[Set]] ( P, V, Receiver )
  
    [...]
    5. Let target be O.[[ProxyTarget]].
    6. Let trap be ? GetMethod(handler, "set").
    7. If trap is undefined, then
      a. Return ? target.[[Set]](P, V, Receiver).
  features: [Proxy, Reflect]
  ---*/
  
  var func = function() {};
  var funcTarget = new Proxy(func, {});
  var funcProxy = new Proxy(funcTarget, {
    set: undefined,
  });
  
  assert(Reflect.set(funcProxy, "prototype", null));
  assert.sameValue(func.prototype, null);
  
  assert(!Reflect.set(funcProxy, "length", 2));
  assert.throws(TypeError, function() {
    "use strict";
    funcProxy.name = "foo";
  });
  
  
  var trapCalls = 0;
  var target = new Proxy({}, {
    set: function(_target, key) {
      trapCalls++;
      return key === "foo";
    },
  });
  
  var proxy = new Proxy(target, {
    set: undefined,
  });
  
  assert(Reflect.set(Object.create(proxy), "foo", 1));
  assert.sameValue(trapCalls, 1);
  
  assert(!Reflect.set(proxy, "bar", 2));
  assert.sameValue(trapCalls, 2);
  