23     function send(key, arg) {  argument
27           arg: arg,  property
37           resume(key, arg);
42     function resume(key, arg) {  argument
44         var result = gen[key](arg);
48           _promise2.default.resolve(value.value).then(function (arg) {  argument
49             resume("next", arg);
50           }, function (arg) {  argument
51             resume("throw", arg);
85         resume(front.key, front.arg);
104   AsyncGenerator.prototype.next = function (arg) {  argument
105     return this._invoke("next", arg);
108   AsyncGenerator.prototype.throw = function (arg) {  argument
109     return this._invoke("throw", arg);
112   AsyncGenerator.prototype.return = function (arg) {
113     return this._invoke("return", arg);