Declaration emit for function parameter type references incorrect type alias

[vsiao]

TypeScript Version: 2.0.10 (broken since 2.0.2).

Code

export type Foo<A, B> = A | B;
export type Bar<T> = Foo<number, T>;

export const f = <T>(bar: Bar<T>) => {
    return true;
};

Expected behavior:
tsc --declaration bar.ts should emit the following bar.d.ts:

export declare type Foo<A, B> = A | B;
export declare type Bar<T> = Foo<number, T>;
export declare const f: <T>(bar: Bar<T>) => boolean;

NB: 2.0.0 emits <T>(bar: number | T) => boolean, which is acceptable too.

Actual behavior:

export declare type Foo<A, B> = A | B;
export declare type Bar<T> = Foo<number, T>;
export declare const f: <T>(bar: Foo<T>) => boolean; 
// TS2314: Generic type 'Foo' requires 2 type argument(s).

[vsiao]

ah, sorry—looks like this was fixed for 2.1: #11931

[vsiao]

Looks good in nightly, but still broken in 2.1.1 (RC). @mhegazy can you confirm which release the fix will be in?