message: Added `^=` assignment operator
diff: -ns loader
  -
  fn main() {
  - math := unwrap(load("source/namespace/math.dyon"))
  - graphics := unwrap(load("source/namespace/graphics.dyon"))
  - main := unwrap(load(
  - source: "source/namespace/main.dyon",
  - imports: [math, graphics]
  - ))
  - call(main, "main", [])
  + x := 3
  + x ^= 2
  + println(x)
  }
  