=== tests/cases/compiler/chainedSpecializationToObjectTypeLiteral.ts ===
interface Sequence<T> {
>Sequence : Sequence<T>
>T : T

    each(iterator: (value: T) => void): void;
>each : (iterator: (value: T) => void) => void
>iterator : (value: T) => void
>value : T
>T : T

    map<U>(iterator: (value: T) => U): Sequence<U>;
>map : <U>(iterator: (value: T) => U) => Sequence<U>
>U : U
>iterator : (value: T) => U
>value : T
>T : T
>U : U
>Sequence : Sequence<T>
>U : U

    filter(iterator: (value: T) => boolean): Sequence<T>;
>filter : (iterator: (value: T) => boolean) => Sequence<T>
>iterator : (value: T) => boolean
>value : T
>T : T
>Sequence : Sequence<T>
>T : T

    groupBy<K>(keySelector: (value: T) => K): Sequence<{ key: K; items: T[]; }>;
>groupBy : <K>(keySelector: (value: T) => K) => Sequence<{ key: K; items: T[]; }>
>K : K
>keySelector : (value: T) => K
>value : T
>T : T
>K : K
>Sequence : Sequence<T>
>key : K
>K : K
>items : T[]
>T : T
}

var s: Sequence<string>;
>s : Sequence<string>
>Sequence : Sequence<T>

var s2 = s.groupBy(s => s.length);
>s2 : Sequence<{ key: number; items: string[]; }>
>s.groupBy(s => s.length) : Sequence<{ key: number; items: string[]; }>
>s.groupBy : <K>(keySelector: (value: string) => K) => Sequence<{ key: K; items: string[]; }>
>s : Sequence<string>
>groupBy : <K>(keySelector: (value: string) => K) => Sequence<{ key: K; items: string[]; }>
>s => s.length : (s: string) => number
>s : string
>s.length : number
>s : string
>length : number

var s3 = s2.each(x => { x.key /* Type is K, should be number */ });
>s3 : void
>s2.each(x => { x.key /* Type is K, should be number */ }) : void
>s2.each : (iterator: (value: { key: number; items: string[]; }) => void) => void
>s2 : Sequence<{ key: number; items: string[]; }>
>each : (iterator: (value: { key: number; items: string[]; }) => void) => void
>x => { x.key /* Type is K, should be number */ } : (x: { key: number; items: string[]; }) => void
>x : { key: number; items: string[]; }
>x.key : number
>x : { key: number; items: string[]; }
>key : number