Implicit any when extending from generic class in JS

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TypeScript Version: nightly (2.5.0-dev.20170707)

Code

C.d.ts

export default class C<T> {
    t: T;
}

D.js

import C from "./C";
class D extends C {}

Expected behavior:

If --noImplicitAny is on, there should be an error that we forgot to provide a type parameter to C.

Actual behavior:

No error.