class C {
    x = 1;
}

var c = new C();
c.x = 3;
var c2 = new C();
var r = c.x === c2.x;

// #31792



class MyMap<K, V> {
    constructor(private readonly Map_: { new<K, V>(): any }) {}
    private readonly store = new this.Map_<K, V>();
}