If I could build escript and run it with just one mix.exs file,
I wondered that handling tiny escript would be more easier.

So I made the following code, built and ran it.
Then it can build, but it seems that it have not found the module at runtime.

Is there a way to make it possible to find the module in the escript at runtime?

/Users/niku/sandbox% elixir -v
Erlang/OTP 19 [erts-8.1] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Elixir 1.4.0-rc.1
/Users/niku/sandbox% ls
mix.exs
/Users/niku/sandbox% cat mix.exs
defmodule MyApp.Mixfile do
  use Mix.Project

  def project do
    [app: :my_app,
     version: "0.0.1",
     escript: escript()]
  end

  def escript do
    [main_module: MyApp.CLI]
  end
end

defmodule MyApp.CLI do
  def main(_args) do
    IO.puts("Hello from MyApp!")
  end
end
/Users/niku/sandbox% mix escript.build
Generated my_app app
Generated escript my_app with MIX_ENV=dev

/Users/niku/sandbox% ls
_build  mix.exs  my_app
/Users/niku/sandbox% ./my_app
** (UndefinedFunctionError) function MyApp.CLI.main/1 is undefined (module MyApp.CLI is not available)
    MyApp.CLI.main([])
    (elixir) lib/kernel/cli.ex:76: anonymous fn/3 in Kernel.CLI.exec_fun/2