λ (c : name),
  get_env >>= λ (env : environment),
    returnex (environment.get env c) >>= λ (decl : declaration),
      return (length (declaration.univ_params decl)) >>= λ (num : ℕ),
        mk_num_meta_univs 2 >>= λ (ls : list level), return (expr.const c ls) :
  name → tactic expr