Check lvalue

import std.stdio : log = writeln;
void main() {
     log("Let's check whether 'this' is an lvalue");
     Button btn = new Button("A button");
}

class Button
{
    this(string btntext)
    {
        mtext = btntext;
        log("button created with the name , ", btntext);
        log(&this);
    }
    private:
    string mtext;
}