TypeScript Version: 2.4.0

Code

function base<T>() {
    class Base {
        static prop: T;
    }
    return Base;
}

class Gen<T> extends base<T>() {}
class Spec extends Gen<string> {}

<string>Spec.prop;

Expected behavior: Either the static property prop is of type string or I'm given an error to prevent this happening earlier with clear error message.

Actual behavior: It claims that prop is of type T.