// Before fix this would take an exceeding long time to complete (#1170)

interface Observable<T> {
    // This member can't be of type T, Property<T>, or Observable<anything but T>
    needThisOne: Observable<T>;
    // Add more to make it slower
    expo1: Property<T[]>; //  0.31 seconds in check
    expo2: Property<T[]>; //  3.11 seconds
    expo3: Property<T[]>; // 82.28 seconds
}
interface Property<T> extends Observable<T> { }

var p: Observable<{}>;
var stuck: Property<number> = p;
