=== tests/cases/compiler/promiseTest.ts ===

interface Promise<T> {
>Promise : Promise<T>
>T : T

    then<A>(success?: (value: T) => Promise<A>): Promise<A>;
>then : { <A>(success?: (value: T) => Promise<A>): Promise<A>; <B>(success?: (value: T) => B): Promise<B>; }
>A : A
>success : (value: T) => Promise<A>
>value : T
>T : T
>Promise : Promise<T>
>A : A
>Promise : Promise<T>
>A : A

    then<B>(success?: (value: T) => B): Promise<B>;
>then : { <A>(success?: (value: T) => Promise<A>): Promise<A>; <B>(success?: (value: T) => B): Promise<B>; }
>B : B
>success : (value: T) => B
>value : T
>T : T
>B : B
>Promise : Promise<T>
>B : B

    data: T;
>data : T
>T : T
}

var p: Promise<number> = null;
>p : Promise<number>
>Promise : Promise<T>

var p2 = p.then(function (x) {
>p2 : Promise<number>
>p.then(function (x) {    return p;} ) : Promise<number>
>p.then : { <A>(success?: (value: number) => Promise<A>): Promise<A>; <B>(success?: (value: number) => B): Promise<B>; }
>p : Promise<number>
>then : { <A>(success?: (value: number) => Promise<A>): Promise<A>; <B>(success?: (value: number) => B): Promise<B>; }
>function (x) {    return p;} : (x: number) => Promise<number>
>x : number

    return p;
>p : Promise<number>

} );

var x = p2.data; // number
>x : number
>p2.data : number
>p2 : Promise<number>
>data : number