text: 'use strict';
  // ECMAScript 6 symbols shim
  
  var global = require("./_global.js");
  var has = require("./_has.js");
  var DESCRIPTORS = require("./_descriptors.js");
  var $export = require("./_export.js");
  var redefine = require("./_redefine.js");
  var META = require("./_meta.js").KEY;
  var $fails = require("./_fails.js");
  var shared = require("./_shared.js");
  var setToStringTag = require("./_set-to-string-tag.js");
  var uid = require("./_uid.js");
  var wks = require("./_wks.js");
  var wksExt = require("./_wks-ext.js");
  var wksDefine = require("./_wks-define.js");
  var enumKeys = require("./_enum-keys.js");
  var isArray = require("./_is-array.js");
  var anObject = require("./_an-object.js");
  var isObject = require("./_is-object.js");
  var toObject = require("./_to-object.js");
  var toIObject = require("./_to-iobject.js");
  var toPrimitive = require("./_to-primitive.js");
  var createDesc = require("./_property-desc.js");
  var _create = require("./_object-create.js");
  var gOPNExt = require("./_object-gopn-ext.js");
  var $GOPD = require("./_object-gopd.js");
  var $GOPS = require("./_object-gops.js");
  var $DP = require("./_object-dp.js");
  var $keys = require("./_object-keys.js");
  var gOPD = $GOPD.f;
  var dP = $DP.f;
  var gOPN = gOPNExt.f;
  var $Symbol = global.Symbol;
  var $JSON = global.JSON;
  var _stringify = $JSON && $JSON.stringify;
  var PROTOTYPE = 'prototype';
  var HIDDEN = wks('_hidden');
  var TO_PRIMITIVE = wks('toPrimitive');
  var isEnum = {}.propertyIsEnumerable;
  var SymbolRegistry = shared('symbol-registry');
  var AllSymbols = shared('symbols');
  var OPSymbols = shared('op-symbols');
  var ObjectProto = Object[PROTOTYPE];
  var USE_NATIVE = typeof $Symbol == 'function' && !!$GOPS.f;
  var QObject = global.QObject;
  // Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
  var setter = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;
  
  // fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
  var setSymbolDesc = DESCRIPTORS && $fails(function () {
    return _create(dP({}, 'a', {
      get: function () {
        return dP(this, 'a', { value: 7 }).a;
      }
    })).a != 7;
  }) ? function (it, key, D) {
    var protoDesc = gOPD(ObjectProto, key);
    if (protoDesc) delete ObjectProto[key];
    dP(it, key, D);
    if (protoDesc && it !== ObjectProto) dP(ObjectProto, key, protoDesc);
  } : dP;
  
  var wrap = function (tag) {
    var sym = AllSymbols[tag] = _create($Symbol[PROTOTYPE]);
    sym._k = tag;
    return sym;
  };
  
  var isSymbol = USE_NATIVE && typeof $Symbol.iterator == 'symbol' ? function (it) {
    return typeof it == 'symbol';
  } : function (it) {
    return it instanceof $Symbol;
  };
  
  var $defineProperty = function defineProperty(it, key, D) {
    if (it === ObjectProto) $defineProperty(OPSymbols, key, D);
    anObject(it);
    key = toPrimitive(key, true);
    anObject(D);
    if (has(AllSymbols, key)) {
      if (!D.enumerable) {
        if (!has(it, HIDDEN)) dP(it, HIDDEN, createDesc(1, {}));
        it[HIDDEN][key] = true;
      } else {
        if (has(it, HIDDEN) && it[HIDDEN][key]) it[HIDDEN][key] = false;
        D = _create(D, { enumerable: createDesc(0, false) });
      }return setSymbolDesc(it, key, D);
    }return dP(it, key, D);
  };
  var $defineProperties = function defineProperties(it, P) {
    anObject(it);
    var keys = enumKeys(P = toIObject(P));
    var i = 0;
    var l = keys.length;
    var key;
    while (l > i) $defineProperty(it, key = keys[i++], P[key]);
    return it;
  };
  var $create = function create(it, P) {
    return P === undefined ? _create(it) : $defineProperties(_create(it), P);
  };
  var $propertyIsEnumerable = function propertyIsEnumerable(key) {
    var E = isEnum.call(this, key = toPrimitive(key, true));
    if (this === ObjectProto && has(AllSymbols, key) && !has(OPSymbols, key)) return false;
    return E || !has(this, key) || !has(AllSymbols, key) || has(this, HIDDEN) && this[HIDDEN][key] ? E : true;
  };
  var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(it, key) {
    it = toIObject(it);
    key = toPrimitive(key, true);
    if (it === ObjectProto && has(AllSymbols, key) && !has(OPSymbols, key)) return;
    var D = gOPD(it, key);
    if (D && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) D.enumerable = true;
    return D;
  };
  var $getOwnPropertyNames = function getOwnPropertyNames(it) {
    var names = gOPN(toIObject(it));
    var result = [];
    var i = 0;
    var key;
    while (names.length > i) {
      if (!has(AllSymbols, key = names[i++]) && key != HIDDEN && key != META) result.push(key);
    }return result;
  };
  var $getOwnPropertySymbols = function getOwnPropertySymbols(it) {
    var IS_OP = it === ObjectProto;
    var names = gOPN(IS_OP ? OPSymbols : toIObject(it));
    var result = [];
    var i = 0;
    var key;
    while (names.length > i) {
      if (has(AllSymbols, key = names[i++]) && (IS_OP ? has(ObjectProto, key) : true)) result.push(AllSymbols[key]);
    }return result;
  };
  
  // 19.4.1.1 Symbol([description])
  if (!USE_NATIVE) {
    $Symbol = function Symbol() {
      if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor!');
      var tag = uid(arguments.length > 0 ? arguments[0] : undefined);
      var $set = function (value) {
        if (this === ObjectProto) $set.call(OPSymbols, value);
        if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;
        setSymbolDesc(this, tag, createDesc(1, value));
      };
      if (DESCRIPTORS && setter) setSymbolDesc(ObjectProto, tag, { configurable: true, set: $set });
      return wrap(tag);
    };
    redefine($Symbol[PROTOTYPE], 'toString', function toString() {
      return this._k;
    });
  
    $GOPD.f = $getOwnPropertyDescriptor;
    $DP.f = $defineProperty;
    require("./_object-gopn.js").f = gOPNExt.f = $getOwnPropertyNames;
    require("./_object-pie.js").f = $propertyIsEnumerable;
    $GOPS.f = $getOwnPropertySymbols;
  
    if (DESCRIPTORS && !require("./_library.js")) {
      redefine(ObjectProto, 'propertyIsEnumerable', $propertyIsEnumerable, true);
    }
  
    wksExt.f = function (name) {
      return wrap(wks(name));
    };
  }
  
  $export($export.G + $export.W + $export.F * !USE_NATIVE, { Symbol: $Symbol });
  
  for (var es6Symbols =
  // 19.4.2.2, 19.4.2.3, 19.4.2.4, 19.4.2.6, 19.4.2.8, 19.4.2.9, 19.4.2.10, 19.4.2.11, 19.4.2.12, 19.4.2.13, 19.4.2.14
  'hasInstance,isConcatSpreadable,iterator,match,replace,search,species,split,toPrimitive,toStringTag,unscopables'.split(','), j = 0; es6Symbols.length > j;) wks(es6Symbols[j++]);
  
  for (var wellKnownSymbols = $keys(wks.store), k = 0; wellKnownSymbols.length > k;) wksDefine(wellKnownSymbols[k++]);
  
  $export($export.S + $export.F * !USE_NATIVE, 'Symbol', {
    // 19.4.2.1 Symbol.for(key)
    'for': function (key) {
      return has(SymbolRegistry, key += '') ? SymbolRegistry[key] : SymbolRegistry[key] = $Symbol(key);
    },
    // 19.4.2.5 Symbol.keyFor(sym)
    keyFor: function keyFor(sym) {
      if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol!');
      for (var key in SymbolRegistry) if (SymbolRegistry[key] === sym) return key;
    },
    useSetter: function () {
      setter = true;
    },
    useSimple: function () {
      setter = false;
    }
  });
  
  $export($export.S + $export.F * !USE_NATIVE, 'Object', {
    // 19.1.2.2 Object.create(O [, Properties])
    create: $create,
    // 19.1.2.4 Object.defineProperty(O, P, Attributes)
    defineProperty: $defineProperty,
    // 19.1.2.3 Object.defineProperties(O, Properties)
    defineProperties: $defineProperties,
    // 19.1.2.6 Object.getOwnPropertyDescriptor(O, P)
    getOwnPropertyDescriptor: $getOwnPropertyDescriptor,
    // 19.1.2.7 Object.getOwnPropertyNames(O)
    getOwnPropertyNames: $getOwnPropertyNames,
    // 19.1.2.8 Object.getOwnPropertySymbols(O)
    getOwnPropertySymbols: $getOwnPropertySymbols
  });
  
  // Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives
  // https://bugs.chromium.org/p/v8/issues/detail?id=3443
  var FAILS_ON_PRIMITIVES = $fails(function () {
    $GOPS.f(1);
  });
  
  $export($export.S + $export.F * FAILS_ON_PRIMITIVES, 'Object', {
    getOwnPropertySymbols: function getOwnPropertySymbols(it) {
      return $GOPS.f(toObject(it));
    }
  });
  
  // 24.3.2 JSON.stringify(value [, replacer [, space]])
  $JSON && $export($export.S + $export.F * (!USE_NATIVE || $fails(function () {
    var S = $Symbol();
    // MS Edge converts symbol values to JSON as {}
    // WebKit converts symbol values to JSON as null
    // V8 throws on boxed symbols
    return _stringify([S]) != '[null]' || _stringify({ a: S }) != '{}' || _stringify(Object(S)) != '{}';
  })), 'JSON', {
    stringify: function stringify(it) {
      var args = [it];
      var i = 1;
      var replacer, $replacer;
      while (arguments.length > i) args.push(arguments[i++]);
      $replacer = replacer = args[1];
      if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
      if (!isArray(replacer)) replacer = function (key, value) {
        if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
        if (!isSymbol(value)) return value;
      };
      args[1] = replacer;
      return _stringify.apply($JSON, args);
    }
  });
  
  // 19.4.3.4 Symbol.prototype[@@toPrimitive](hint)
  $Symbol[PROTOTYPE][TO_PRIMITIVE] || require("./_hide.js")($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);
  // 19.4.3.5 Symbol.prototype[@@toStringTag]
  setToStringTag($Symbol, 'Symbol');
  // 20.2.1.9 Math[@@toStringTag]
  setToStringTag(Math, 'Math', true);
  // 24.3.3 JSON[@@toStringTag]
  setToStringTag(global.JSON, 'JSON', true);