Closed
Description
Minimized code
scala file failing to compile:
import com.badlogic.gdx.graphics.g2d.ParticleEffectPool
case class DrawParticleEffect(effect: ParticleEffectPool)mill build file build.sc, use this to fetch the ParticleEffectPool class which causes the issue :
import Deps._
import mill._
import mill.scalalib._
import mill.scalalib.scalafmt._
object `gdx-lib` extends Common {
override def ivyDeps = Agg(
Gdx.Core,
Gdx.Backend,
Gdx.Native,
Gdx.Controllers
)
}
trait Common extends SbtModule with ScalafmtModule {
override def scalaVersion = Deps.ScalaVersion
override def scalacOptions = Seq("-deprecation", "-feature", "-unchecked")
}
object Deps {
val ScalaVersion = "3.0.0-M3"
object Gdx {
private val Version = "1.9.12"
val Core = ivy"com.badlogicgames.gdx:gdx:$Version"
val Backend = ivy"com.badlogicgames.gdx:gdx-backend-lwjgl3:$Version"
val BackendHeadless = ivy"com.badlogicgames.gdx:gdx-backend-headless:$Version"
val Native = ivy"com.badlogicgames.gdx:gdx-platform:$Version;classifier=natives-desktop"
val Controllers = ivy"com.badlogicgames.gdx:gdx-controllers-lwjgl3:$Version"
}
}
use mill __.compile to compile and get the error.
Output
[info] Compiling 1 Scala source to /home/ariskk/temp/scala3issue/out/gdx-lib/compile/dest/classes ...
exception caught when loading class ParticleEffectPool: Cyclic reference involving class ParticleEffectPool
[error] -- [E046] Cyclic Error: /home/ariskk/temp/scala3issue/gdx-lib/src/main/scala/games/lib/draw/DrawParticleEffect.scala:8:81
[error] 8 |case class DrawParticleEffect(renderPriority: Float, x: Float, y: Float, effect: ParticleEffectPool, scaleFactor: Float = 1) {}
[error] | ^
[error] | Cyclic reference involving class ParticleEffectPool
[error] one error found
Expectation
This should compile. It compiles ok with scala 2.13.4 but it could be a class file issue from the gdx library.