The "-Wvalue-discard" flag doesn't seem to work with the `IO` monad

scala3.3.0-RC1-value-discard.scala

//> using scala "3.3.0-RC1"
//> using lib "org.typelevel::cats-effect:3.4.5"
//> using plugin "com.github.ghik:::zerowaste:0.2.3"
//> using options "-Wunused:imports"
//> using options "-Werror"
//> using options "-Wvalue-discard"

import cats.effect.*

object Main extends IOApp.Simple:
  def run: IO[Unit] =
    IO.pure("discarded")
    IO.println("foo") *> IO.println("bar")

Still an issue with 3.4.0.

//> using scala "3.4.0"
//> using dep "org.typelevel::cats-effect:3.5.4"
//> using options "-Wunused:imports"
//> using options "-Werror"
//> using options "-Wvalue-discard"

import cats.effect.*

object Main extends IOApp.Simple:
  def run: IO[Unit] =
    IO.pure("discarded")
    IO.println("foo") *> IO.println("bar")

As @BalmungSan pointed out here, you're searching for nonunit-statements

//> using scala 3.4.1
//> using toolkit typelevel::latest
//> using options -Wunused:imports, -Werror, -Wnonunit-statement

import cats.effect.*

object Main extends IOApp.Simple:
  def run: IO[Unit] =
    IO.pure("discarded")
    IO.println("foo") *> IO.println("bar")