class [static] ARootClass{ // A top level class, no instances
   class A{ self.println(" constructor"); } // a regular class
   class B(A){ // ditto
      var x;
      fcn init(x=123){ self.x=x }
      fcn toString{ "x is "+x }
   }
}

ARootClass.B(456).println(); // create an instance
   // prints:
   Class(A) constructor
   x is 456

f:=File("object.dat","wb");
Compiler.Asm.writeRootClass(ARootClass,f); // serialize to file
f.close();

f:=File("object.dat","rb");
rc:=Compiler.Asm.readRootClass(f); // read and re-create
   // prints (readRootClass calls all constructors by default):
   Class(A) constructor
f.close();
rc.B().println();  // create a new instance of B
   // prints:
   x is 123