Load all modules implementing a behaviour in escript

Questions & Help Questions
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11

Tried this, no success:

defprotocol EscriptTestbed.ScenarioProtocol do
  @spec run(any()) :: any()
  def run(_)
end

defimpl EscriptTestbed.ScenarioProtocol, for: EscriptTestbed.Scenarios.DataSetA do
  def run(_), do: {:error, :use_scenario_directly}
end

defimpl EscriptTestbed.ScenarioProtocol, for: EscriptTestbed.Scenarios.DataSetB do
  def run(_), do: {:error, :use_scenario_directly}
end

And then use in CLI via one of:

Protocol.extract_impls(EscriptTestbed.ScenarioProtocol, :code.lib_dir(:elixir, :escript_testbed))
Protocol.extract_impls(EscriptTestbed.ScenarioProtocol, String.to_charlist(Application.app_dir(:escript_testbed)))
Protocol.extract_protocols(:code.lib_dir(:elixir, :escript_testbed))
Protocol.extract_protocols(String.to_charlist(Application.app_dir(:escript_testbed)))

All return empty list. It’s likely though that I’m not using it correctly!