// @jit-debug
// @plugin-builtins

// MapBox end-to-end via InvokePolicy/Observe
// - Exercises: size/get/has/set on plugin-builtins path

static box Main {
  main() {
    local m, ok, v, sz
    m = new MapBox()
    m.set(1, 100)
    m.set(2, 200)
    ok = m.has(1)
    v = m.get(1)
    sz = m.size()
    return sz  // expect: 2
  }
}