=== tests/cases/compiler/ipromise4.ts ===
declare module Windows.Foundation {
>Windows : unknown
>Foundation : unknown

    export interface IPromise<T> {
>IPromise : IPromise<T>
>T : T

        then<U>(success?: (value: T) => IPromise<U>, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void ): Windows.Foundation.IPromise<U>;
>then : { <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; }
>U : U
>success : (value: T) => IPromise<U>
>value : T
>T : T
>IPromise : IPromise<T>
>U : U
>error : (error: any) => IPromise<U>
>error : any
>IPromise : IPromise<T>
>U : U
>progress : (progress: any) => void
>progress : any
>Windows : unknown
>Foundation : unknown
>IPromise : IPromise<T>
>U : U

        then<U>(success?: (value: T) => IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void ): Windows.Foundation.IPromise<U>;
>then : { <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; }
>U : U
>success : (value: T) => IPromise<U>
>value : T
>T : T
>IPromise : IPromise<T>
>U : U
>error : (error: any) => U
>error : any
>U : U
>progress : (progress: any) => void
>progress : any
>Windows : unknown
>Foundation : unknown
>IPromise : IPromise<T>
>U : U

        then<U>(success?: (value: T) => U, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void ): Windows.Foundation.IPromise<U>;
>then : { <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; }
>U : U
>success : (value: T) => U
>value : T
>T : T
>U : U
>error : (error: any) => IPromise<U>
>error : any
>IPromise : IPromise<T>
>U : U
>progress : (progress: any) => void
>progress : any
>Windows : unknown
>Foundation : unknown
>IPromise : IPromise<T>
>U : U

        then<U>(success?: (value: T) => U, error?: (error: any) => U, progress?: (progress: any) => void ): Windows.Foundation.IPromise<U>;
>then : { <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>; <U>(success?: (value: T) => U, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>; }
>U : U
>success : (value: T) => U
>value : T
>T : T
>U : U
>error : (error: any) => U
>error : any
>U : U
>progress : (progress: any) => void
>progress : any
>Windows : unknown
>Foundation : unknown
>IPromise : IPromise<T>
>U : U

        done? <U>(success?: (value: T) => any, error?: (error: any) => any, progress?: (progress: any) => void ): void;
>done : <U>(success?: (value: T) => any, error?: (error: any) => any, progress?: (progress: any) => void) => void
>U : U
>success : (value: T) => any
>value : T
>T : T
>error : (error: any) => any
>error : any
>progress : (progress: any) => void
>progress : any
    }
}
 
var p: Windows.Foundation.IPromise<number> = null;
>p : Windows.Foundation.IPromise<number>
>Windows : unknown
>Foundation : unknown
>IPromise : Windows.Foundation.IPromise<T>
 
p.then(function (x) { } ); // should not error
>p.then(function (x) { } ) : Windows.Foundation.IPromise<void>
>p.then : { <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; }
>p : Windows.Foundation.IPromise<number>
>then : { <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; }
>function (x) { } : (x: number) => void
>x : number

p.then(function (x) { return "hello"; } ).then(function (x) { return x } ); // should not error
>p.then(function (x) { return "hello"; } ).then(function (x) { return x } ) : Windows.Foundation.IPromise<string>
>p.then(function (x) { return "hello"; } ).then : { <U>(success?: (value: string) => Windows.Foundation.IPromise<U>, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: string) => Windows.Foundation.IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: string) => U, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: string) => U, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; }
>p.then(function (x) { return "hello"; } ) : Windows.Foundation.IPromise<string>
>p.then : { <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; }
>p : Windows.Foundation.IPromise<number>
>then : { <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => Windows.Foundation.IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: number) => U, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; }
>function (x) { return "hello"; } : (x: number) => string
>x : number
>then : { <U>(success?: (value: string) => Windows.Foundation.IPromise<U>, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: string) => Windows.Foundation.IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: string) => U, error?: (error: any) => Windows.Foundation.IPromise<U>, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; <U>(success?: (value: string) => U, error?: (error: any) => U, progress?: (progress: any) => void): Windows.Foundation.IPromise<U>; }
>function (x) { return x } : (x: string) => string
>x : string
>x : string