After looking at this more closely we decided this is a wont fix in Elixir. Mix is not intended to be called from iex or inside of your application. The primary interface is the CLI and because of this tasks are allowed to only run once.
You have to compile the dependency from the command line and restart the application. An application shouldn’t be recompiled after it has started, since it can have new modules, changed environment, or even changed supervision tree. If you don’t want to restart your application it is safest to use the OTP application upgrade mechanisms.
