Fix $q.when definition

angularjs/angular-tests.ts

@@ -94,6 +94,7 @@ module HttpAndRegularPromiseTests {
         person: Person;
         theAnswer: number;
         letters: string[];
+		snack: string;
     }
 
     var someController: Function = ($scope: SomeControllerScope, $http: ng.IHttpService, $q: ng.IQService) => {
@@ -132,6 +133,12 @@ module HttpAndRegularPromiseTests {
         cPromise.then((letters: string[]) => {
             $scope.letters = letters;
         });
+
+		// When $q.when is passed an IPromise<T>, it returns an IPromise<T>
+		var dPromise: ng.IPromise<string> = $q.when($q.when("ALBATROSS!"));
+		dPromise.then((snack: string) => {
+			$scope.snack = snack;
+		});
     }
 
   // Test that we can pass around a type-checked success/error Promise Callback

angularjs/angular.d.ts

@@ -455,6 +455,7 @@ declare module ng {
         all(promises: {[id: string]: IPromise<any>;}): IPromise<{[id: string]: any}>;
         defer<T>(): IDeferred<T>;
         reject(reason?: any): IPromise<void>;
+        when<T>(value: IPromise<T>): IPromise<T>;
         when<T>(value: T): IPromise<T>;
     }