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Elegant error/exception handling in Elixir, with result monads.

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ok lib ok bind_error.ex
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lib/ok/bind_error.ex 

defmodule OK.BindError do

  defexception [:return, :lhs, :rhs]



  def message(%{return: return, lhs: lhs, rhs: rhs}) do

    """

    no binding to right hand side value: '#{inspect(return)}'



        Code

          #{lhs} <- #{rhs}



        Expected signature

          #{rhs} :: {:ok, #{lhs}} | {:error, reason}



        Actual values

          #{rhs} :: #{inspect(return)}

    """

  end

end