// from spec

class Employee {
    public name: string;
    public address: string;
    public retired = false;
    public manager: Employee = null;
    public reports: Employee[] = [];
}

class Employee2 {
    public name: string;
    public address: string;
    public retired: boolean;
    public manager: Employee;
    public reports: Employee[];
    constructor() {
        this.retired = false;
        this.manager = null;
        this.reports = [];
    }
}

var e1: Employee;
var e2: Employee2;
e1 = e2;
e2 = e1;