demonstrage dyn trait object demo in moonbit

dyn-trait.mbt

trait Eff {
  run(Self) -> Unit
} 

struct A {
  a: Int
} derive (Debug)

fn A::run(self: A)-> Unit {
  println("DEMO")
}

struct B {
  b: String
} derive (Debug)

fn B::run(self: B)->Unit {
  println("DEMO")
}

struct Combined {
  c: Array[Eff]
}

fn init {
  let a = {a: 1}
  let b ={b:"ccc"}
  let c = {c: [a as Eff, b as Eff]}
  debug(a)
  debug(b)
  debug(c.c.length())
}