merge two Module's function

gistfile1.ex

defmodule M1 do
  def fun(:arg1) do
    IO.puts "arg1"
  end
end

defmodule M2 do
  def fun(:arg2) do
    IO.puts "arg2"
  end
end

defmodule M3 do
  def tryfun([], _), do: "not found"
  def tryfun([{m, f}|t], a) do
    try do
      apply m, f, a
    rescue
      [FunctionClauseError] ->
        tryfun(t, a)
    end
  end

  def go(x) do
    fm_list = [{M1, :fun}, {M2, :fun}]
    tryfun(fm_list, [x])
  end
end%