How check if destructor has been called?

[Injeckt via Digitalmars-d-learn]

Hi, I'm trying to check if destructor has been called, but when 
I'm deleting class object I didn't get any calls from destructor.

myclass.d
    ~this() {
        this.log("\nDestructor\n");
        this._free_trash();
    }


main.d

    try {
        server.server_init(server);
    } catch (Exception e) {
        server.log(e.msg);
        server = null;
    }