(module ctt2_collision_lib
  (import ctt2_collision_cls)
  (data Foo
    (ctor MkLib))
  (instance
    (class ctt2_collision_cls.MyC)
    (type (con Foo))
    (method op
      (body (lam (params (typed _x (con Foo))) (ret (con Int)) (body 2))))))