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post.scala

class Calc[F[_] : Sync] {
  def calculateSomething(args: List[String]): Int = ???
  
  def measureCalculation(args: List[String]): F[(Int, Long)] = {
    val time: F[Long] = Sync[F].delay { System.currentTimeMillis() }

    for {
      t1 <- time
      x = calculateSomething(args)
      t2 <- time
    } yield (x, t2 - t1)
  }
}