In fact it’s a « normal » behavior. You asked for a compiled env. but application/0 sounds like to be available only in runtime.
So it doesn’t compile because you want a compiled env var that is not available.
However I don’t know if it’s a normal that the ˋapplication/0` is not available in compile time.
Share the issue please, I would like to follow that 
For the moment add your env in config file it should work.
