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=== tests/cases/compiler/promiseTest.ts ===
interface Promise<T> {
then<A>(success?: (value: T) => Promise<A>): Promise<A>;
>then : { <TResult1 = T, TResult2 = never>(onfulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2>; <A>(success?: (value: T) => Promise<A>): Promise<A>; <B>(success?: (value: T) => B): Promise<B>; }
>success : (value: T) => Promise<A>
>value : T
then<B>(success?: (value: T) => B): Promise<B>;
>then : { <TResult1 = T, TResult2 = never>(onfulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2>; <A>(success?: (value: T) => Promise<A>): Promise<A>; <B>(success?: (value: T) => B): Promise<B>; }
>success : (value: T) => B
>value : T
data: T;
>data : T
}
var p: Promise<number> = null;
>p : Promise<number>
>null : null
var p2 = p.then(function (x) {
>p2 : Promise<number>
>p.then(function (x) { return p;} ) : Promise<number>
>p.then : { <TResult1 = number, TResult2 = never>(onfulfilled?: (value: number) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2>; <A>(success?: (value: number) => Promise<A>): Promise<A>; <B>(success?: (value: number) => B): Promise<B>; }
>p : Promise<number>
>then : { <TResult1 = number, TResult2 = never>(onfulfilled?: (value: number) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2>; <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
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