mute on defstruct and defdelegate

[dkuku]

Hi, something I spotted when trying to run on one of my toy projects:
I'm using gen_state_machine and depending on a module variant I pass to my machine it uses different logic.
mix_unused catches all my defstruct definitions and delegates as unused:

  defdelegate fetch(term, key), to: Map
  defdelegate get(term, key, default), to: Map
  defdelegate get_and_update(term, key, fun), to: Map
  defstruct @valid_moves

hint: %Score{} is unused
    lib/variants/score.ex:110

hint: Score.fetch/2 is unused
    lib/variants/score.ex:107

hint: Score.get/3 is unused
    lib/variants/score.ex:108

hint: Score.get_and_update/3 is unused
    lib/variants/score.ex:109

[hauleth]

Struct should be properly detected if it is used anywhere in the codebase, so simple %Score{} should be detected as usage of struct.

I can check if it is possible to extract the fact that it is defdelegate and then set it in metadata, so it should be then possible to filter using that on user end.