Use IO to wrap each loop

io-loop.scala

import cats.effect._

def retryIfNone(innerIO: IO[Option[Int]]): IO[Int] = {
  innerIO.flatMap {
    case Some(i) => 
      println("something") // used to show some output when testing 
      IO.pure(i)
    case None => 
      println("nothing")  // used to show some output when testing
      retryIfNone(innerIO)
  }
}