let t = make()
  ::log()

let t2 = set(t, 'x', 1)::log()

let t3 = del(set(set(set(t2, 'y', 2), 'z', 5), 'x', 3), 'z')::log()

map(t3, v => v +1)::log()

t::get('z')::log()