@template tag takes effect in TypeScript code

TypeScript Version: nightly (2.4.0-dev.20170608)

Code

interface I { n: number; }

class C<T extends I> {
    constructor(readonly t: T) {}

    /** @template U */
    static create<U extends I>(u: U): C<U> {
        return new C(u);
    }
}

Expected behavior:

No error.

Actual behavior:

src/a.ts(7,41): error TS2344: Type 'U' does not satisfy the constraint 'I'.
src/a.ts(8,22): error TS2345: Argument of type 'U' is not assignable to parameter of type 'I'.

(Broken by #15856)

[mhegazy]

looks like we missed this one in the binder update. can you look into it.