1050 Promise.prototype._attachCancellationCallback = function(onCancel) {  argument
1065         executor(resolve, reject, function(onCancel) {  argument
1066             if (typeof onCancel !== "function") {
1068                                     util.toString(onCancel));
1070             promise._attachCancellationCallback(onCancel);
1077 function cancellationAttachCancellationCallback(onCancel) {  argument
1083             previousOnCancel.push(onCancel);
1085             this._setOnCancel([previousOnCancel, onCancel]);
1088         this._setOnCancel(onCancel);
1096 function cancellationSetOnCancel(onCancel) {  argument
1097     this._onCancelField = onCancel;