type Singleton
model
  text greeting
  fun speak = void by block do writeLine(me.greeting + " I'm a singleton") end
end
Singleton instance
fun getInstance = Singleton by block
  if instance == null do instance = Singleton() end
  return instance
end
type SomeOtherType
Singleton s1 = Singleton.getInstance()
s1.greeting = "Hello"
Singleton s2 = Singleton.getInstance()
s2.greeting.append(", World!")
writeLine(s1 + " and " + s2 + " are the same object: " + (s1 == s2) + ", s2: " + s2.greeting)
s1.speak() # call instance method