Display args in Err objects!

[cognivore]

Why?

With this code:

@spec mk58(binary()) :: Result.possibly(FiftyEight.t())
  def mk58(x) do
    Result.new(fn ->
      mk58!(x)
    end)
  end

  @spec mk58!(binary()) :: Result.possibly(FiftyEight.t())
  def mk58!(<<x::binary>>) do
    (Result.new(fn ->
       %FiftyEight{
         encoded: x,
         raw: decode58(x)
       }
     end)
     |> tap(fn y ->
       assert Result.is_ok?(y),
              "Base58-decode failed to decode #{inspect(x)}. Invalid characters?"
     end)).ok
  end

I get this error:

iex(9)> Uptight.Base.mk58({1})
%Uptight.Result.Err{
err: %Uptight.Trace{
  exception: %FunctionClauseError{
    module: Uptight.Base,
    function: :mk58!,
    arity: 1,
    kind: nil,
    args: nil,
    clauses: nil
  },
  stacktrace: [
    {Uptight.Base, :mk58!, [{1}], [file: 'lib/uptight/base.ex', line: 103]},
    {Uptight.Result, :new, 1, [file: 'lib/uptight/result.ex', line: 62]},
    {:erl_eval, :do_apply, 6, [file: 'erl_eval.erl', line: 685]},
    {:elixir, :eval_forms, 4, [file: 'src/elixir.erl', line: 294]},
    {Module.ParallelChecker, :verify, 1,
     [file: 'lib/module/parallel_checker.ex', line: 110]},
    {IEx.Evaluator, :eval_and_inspect, 3,
     [file: 'lib/iex/evaluator.ex', line: 329]},
    {IEx.Evaluator, :eval_and_inspect_parsed, 3,
     [file: 'lib/iex/evaluator.ex', line: 303]},
    {IEx.Evaluator, :parse_eval_inspect, 3,
     [file: 'lib/iex/evaluator.ex', line: 292]}
  ]
}
}

Which is unacceptable.