Function that allows values to be discarded in a visible way. Combined with Scalac flags: `-Ywarn-value-discard` (and maybe `-Xfatal-warnings`).

Usage.scala

scala> ValueDiscard[Int](5)

scala> ValueDiscard(5)
<console>:12: error: ValueDiscard.type does not take parameters
       ValueDiscard(5)
                   ^

ValueDiscard.scala

object ValueDiscard {
  /**
    * Function that allows values to be discarded in a visible way.
    *
    * @tparam T type of the value that will be computed (it won't be inferred,
    *   must be specified)
    * @return function accepting value expression that needs to be computed and
    *   whose value will be discarded
    */
  def apply[T]: (=> T) => Unit = { value =>
    val _ = value
  }
}