--- /dev/null
+var global = require('../internals/global');
+var getBuiltIn = require('../internals/get-built-in');
+var isCallable = require('../internals/is-callable');
+var isPrototypeOf = require('../internals/object-is-prototype-of');
+var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
+
+var Object = global.Object;
+
+module.exports = USE_SYMBOL_AS_UID ? function (it) {
+ return typeof it == 'symbol';
+} : function (it) {
+ var $Symbol = getBuiltIn('Symbol');
+ return isCallable($Symbol) && isPrototypeOf($Symbol.prototype, Object(it));
+};