How to use ValDef in ClassDef

[yankun1992]

I have a trait

trait CoroutineState {
  def resume(reply: Any): Unit
  def resumable(): Boolean
}

and i want automatically generate class by code context，for example according to code context, the macro need to generate a Class like

final class SuspendState1 {
  // some variable between more than one suspend point, use this variable to replace stack variable in code context
  var variable1: Int  = _
  var variable2: String = _

  // some variable depend on async result
  var ioResult: Int = _

  override def resume(reply: Any): Unit = ioResult = reply // call by coroutine schedule system
  override def resumable(): Boolean = ioResult != null
}

macro using to generate to class is

@experimental
private def generateClassDef(name: String): q.reflect.ClassDef = {
  import q.reflect.*
  val parents = List(TypeTree.of[Object], TypeTree.of[CoroutineState])

  val vals = List(("variable1", TypeTree.of[Int | Null]), ("variable2", TypeTree.of[String | Null]))

  val decls = (cls: Symbol) =>
    // vals.map(va => Symbol.newMethod(cls, va._1 + "_=", MethodType(List(va._1 + "x"))(_ => List(va._2.tpe), _ => TypeRepr.of[Unit]))) ++
    // vals.map(va => Symbol.newMethod(cls, "set_" + va._1, MethodType(List(va._1 + "x"))(_ => List(va._2.tpe), _ => TypeRepr.of[Unit]))) ++
    // vals.map(va => Symbol.newMethod(cls, "get_" + va._1, MethodType(Nil)(_ => Nil, _ => va._2.tpe))) ++
    vals.map(va => Symbol.newVal(cls, va._1, va._2.tpe, Flags.Mutable, Symbol.noSymbol)) :+
      Symbol.newMethod(cls, "resume", MethodType(List("reply"))(_ => List(TypeRepr.of[Any]), _ => TypeRepr.of[Unit])) :+
      Symbol.newMethod(cls, "resumable", MethodType(Nil)(_ => Nil, _ => TypeRepr.of[Boolean]))

  val clzSym = Symbol.newClass(Symbol.spliceOwner, name, parents.map(_.tpe), decls, selfType = None)
  val receiveSymbol = clzSym.declaredMethod("resume").head
  val resumeSymbol = clzSym.declaredMethod("resumable").head

  val resumeDef = DefDef(resumeSymbol, argss => Some('{ true }.asTerm))
  val receiveDef = DefDef(receiveSymbol, argss => Some('{}.asTerm))

  val valDef = vals.map(va => ValDef(clzSym.declaredField(va._1), Some('{ null }.asTerm)))

  // val varDef = vals.map { va => DefDef(clzSym.declaredMethod(va._1 + "_=").head, argss => Some('{ (): Unit }.asTerm)) }
  // val getters = vals.map(va => DefDef(clzSym.declaredMethod("get_" + va._1).head, argss => Some(Select.unique(This(clzSym), va._1))))
  // val setters =
  // vals.map(va => DefDef(clzSym.declaredMethod("set_" + va._1).head, argss => Some(Assign(Select.unique(This(clzSym), va._1), '{ null }.asTerm))))

  val clsDef = ClassDef(clzSym, parents, body = valDef :+ receiveDef :+ resumeDef)

  clsDef
}

the macro can generate the class but when compiler compile the generated class , the compiler throws

[error] java.lang.AssertionError: assertion failed: setter variable1_= entered in class HelloState2 at undeclared phase getters
[error] scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
[error] dotty.tools.dotc.core.Symbols$Symbol.enteredAfter(Symbols.scala:227)
[error] dotty.tools.dotc.core.Symbols$Symbol.enteredAfter(Symbols.scala:219)
[error] dotty.tools.dotc.transform.Getters.ensureSetter(Getters.scala:102)
[error] dotty.tools.dotc.transform.Getters.transformValDef(Getters.scala:109)
[error] dotty.tools.dotc.transform.MegaPhase.goValDef(MegaPhase.scala:965)
[error] dotty.tools.dotc.transform.MegaPhase.goValDef(MegaPhase.scala:966)
[error] dotty.tools.dotc.transform.MegaPhase.goValDef(MegaPhase.scala:966)
[error] dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:240)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:425)
[error] dotty.tools.dotc.transform.MegaPhase.loop$1(MegaPhase.scala:438)
[error] dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:438)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:359)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:255)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:425)
[error] dotty.tools.dotc.transform.MegaPhase.loop$2(MegaPhase.scala:444)
[error] dotty.tools.dotc.transform.MegaPhase.transformBlock(MegaPhase.scala:449)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:298)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:394)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:423)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:320)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:423)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:394)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.mapDefDef$1(MegaPhase.scala:248)
[error] dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:251)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:425)
[error] dotty.tools.dotc.transform.MegaPhase.loop$1(MegaPhase.scala:438)
[error] dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:438)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:359)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformNamed$1(MegaPhase.scala:255)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:425)
[error] dotty.tools.dotc.transform.MegaPhase.loop$1(MegaPhase.scala:438)
[error] dotty.tools.dotc.transform.MegaPhase.transformStats(MegaPhase.scala:438)
[error] dotty.tools.dotc.transform.MegaPhase.mapPackage$1(MegaPhase.scala:379)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnnamed$1(MegaPhase.scala:382)
[error] dotty.tools.dotc.transform.MegaPhase.transformTree(MegaPhase.scala:427)
[error] dotty.tools.dotc.transform.MegaPhase.transformUnit(MegaPhase.scala:454)
[error] dotty.tools.dotc.transform.MegaPhase.run(MegaPhase.scala:466)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:311)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:312)
[error] dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:234)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1328)
[error] dotty.tools.dotc.Run.runPhases$1(Run.scala:245)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:253)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:262)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:68)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:262)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:186)
[error] dotty.tools.dotc.Run.compile(Run.scala:170)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:179)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:177)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:463)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:418)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:405)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:171)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2363)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2313)
[error] sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:30)
[error] sbt.internal.io.Retry$.apply(Retry.scala:46)
[error] sbt.internal.io.Retry$.apply(Retry.scala:28)
[error] sbt.internal.io.Retry$.apply(Retry.scala:23)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:30)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2311)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:68)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:282)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
[error] sbt.Execute.work(Execute.scala:291)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:282)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
[error] java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error] java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error] java.lang.Thread.run(Thread.java:748)