I wonder if there’s a way to conditionally define functions and not have this warning go off.

In my config I have this simple line
config :my_app, :environment, config_env()

So with a module

defmodule MyApp.Example do
  @env Application.compile_env(:my_app, :environment)
  @attribute "This will trigger a warning"
  
  if @env == :prod do
    def some_func(), do: @attribute
  else
    def some_func(), do: "no attribute"
  end
end

In development (or any environment that is not production) this will cause a warning “module attribute @attribute was set but never used”.

Fully aware that I might be doing something I shouldn’t be doing, and it’s a very rare occurrence, I just need to really make sure certain things only have active code in production and nowhere else. The warning is still the same if I use a guard.