scalac expr_pickle_crash.scala error when pickling type T error when pickling type Iterable[T] error when pickling type Expr.UpcastToIterable[Any, Iterable[T]] error when pickling type Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type error when pickling type = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type error when pickling type scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type } error when pickling type scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } error when pickling tree scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } of class class dotty.tools.dotc.ast.Trees$InferredTypeTree error when pickling tree val x$proxy1: scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } = Expr.$asInstanceOf[ scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } ] of class class dotty.tools.dotc.ast.Trees$ValDef error when pickling tree { val x$proxy1: scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } = Expr.$asInstanceOf[ scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } ] x$proxy1 } of class class dotty.tools.dotc.ast.Trees$Inlined error when pickling tree () extends Object(), scala.deriving.Mirror.Sum { this: Expr.type => private def writeReplace(): AnyRef = new scala.runtime.ModuleSerializationProxy(classOf[Expr.type]) final case class UpcastToIterable[T >: Nothing <: Any, C >: Nothing <: Iterable[T]]() extends Expr() { override def hashCode(): Int = -1772009433 override def equals(x$0: Any): Boolean = (this eq x$0.$asInstanceOf[Object]) || (x$0 match { case x$0 @ _:Expr.UpcastToIterable[T, C] @unchecked => true case _ => false } ) override def toString(): String = scala.runtime.ScalaRunTime._toString(this) override def canEqual(that: Any): Boolean = that.isInstanceOf[Expr.UpcastToIterable[T, C] @unchecked] override def productArity: Int = 0 override def productPrefix: String = "UpcastToIterable" override def productElement(n: Int): Any = n match { case _ => throw new IndexOutOfBoundsException(n.toString()) } override def productElementName(n: Int): String = n match { case _ => throw new IndexOutOfBoundsException(n.toString()) } T C <: Iterable[T] def copy[T, C <: Iterable[T]](): Expr.UpcastToIterable[T, C] = new Expr.UpcastToIterable[T, C]() def ordinal: Int = 0 } final lazy module val UpcastToIterable: Expr.UpcastToIterable = new Expr.UpcastToIterable() final module class UpcastToIterable() extends AnyRef(), scala.deriving.Mirror.Product { this: Expr.UpcastToIterable.type => private def writeReplace(): AnyRef = new scala.runtime.ModuleSerializationProxy( classOf[Expr.UpcastToIterable.type]) def apply[T, C <: Iterable[T]](): Expr.UpcastToIterable[T, C] = new Expr.UpcastToIterable[T, C]() def unapply[T, C <: Iterable[T]](x$1: Expr.UpcastToIterable[T, C]): true = true override def toString: String = "UpcastToIterable" type MirroredMonoType = Expr.UpcastToIterable[? <: AnyKind, ? <: AnyKind] def fromProduct(x$0: Product): Expr.UpcastToIterable.MirroredMonoType = { new Expr.UpcastToIterable[Any, Iterable[Any]]() } } def fromOrdinal(ordinal: Int): Expr = throw new NoSuchElementException( "enum Expr has no case with ordinal: " + ordinal.toString()) { val x$proxy1: scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } = Expr.$asInstanceOf[ scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } ] x$proxy1 } type MirroredMonoType = Expr def ordinal(x$0: Expr.MirroredMonoType): Int = x$0.ordinal } of class class dotty.tools.dotc.ast.Trees$Template error when pickling tree @SourceFile("expr_pickle_crash.scala") final module class Expr() extends Object(), scala.deriving.Mirror.Sum { this: Expr.type => private def writeReplace(): AnyRef = new scala.runtime.ModuleSerializationProxy(classOf[Expr.type]) final case class UpcastToIterable[T >: Nothing <: Any, C >: Nothing <: Iterable[T]]() extends Expr() { override def hashCode(): Int = -1772009433 override def equals(x$0: Any): Boolean = (this eq x$0.$asInstanceOf[Object]) || (x$0 match { case x$0 @ _:Expr.UpcastToIterable[T, C] @unchecked => true case _ => false } ) override def toString(): String = scala.runtime.ScalaRunTime._toString(this) override def canEqual(that: Any): Boolean = that.isInstanceOf[Expr.UpcastToIterable[T, C] @unchecked] override def productArity: Int = 0 override def productPrefix: String = "UpcastToIterable" override def productElement(n: Int): Any = n match { case _ => throw new IndexOutOfBoundsException(n.toString()) } override def productElementName(n: Int): String = n match { case _ => throw new IndexOutOfBoundsException(n.toString()) } T C <: Iterable[T] def copy[T, C <: Iterable[T]](): Expr.UpcastToIterable[T, C] = new Expr.UpcastToIterable[T, C]() def ordinal: Int = 0 } final lazy module val UpcastToIterable: Expr.UpcastToIterable = new Expr.UpcastToIterable() final module class UpcastToIterable() extends AnyRef(), scala.deriving.Mirror.Product { this: Expr.UpcastToIterable.type => private def writeReplace(): AnyRef = new scala.runtime.ModuleSerializationProxy( classOf[Expr.UpcastToIterable.type]) def apply[T, C <: Iterable[T]](): Expr.UpcastToIterable[T, C] = new Expr.UpcastToIterable[T, C]() def unapply[T, C <: Iterable[T]](x$1: Expr.UpcastToIterable[T, C]): true = true override def toString: String = "UpcastToIterable" type MirroredMonoType = Expr.UpcastToIterable[? <: AnyKind, ? <: AnyKind] def fromProduct(x$0: Product): Expr.UpcastToIterable.MirroredMonoType = { new Expr.UpcastToIterable[Any, Iterable[Any]]() } } def fromOrdinal(ordinal: Int): Expr = throw new NoSuchElementException( "enum Expr has no case with ordinal: " + ordinal.toString()) { val x$proxy1: scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } = Expr.$asInstanceOf[ scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } ] x$proxy1 } type MirroredMonoType = Expr def ordinal(x$0: Expr.MirroredMonoType): Int = x$0.ordinal } of class class dotty.tools.dotc.ast.Trees$TypeDef error when pickling tree package <empty> { @SourceFile("expr_pickle_crash.scala") @Child[Expr.UpcastToIterable] sealed abstract class Expr() extends Object(), scala.reflect.Enum { import Expr.UpcastToIterable } final lazy module val Expr: Expr = new Expr() @SourceFile("expr_pickle_crash.scala") final module class Expr() extends Object(), scala.deriving.Mirror.Sum { this: Expr.type => private def writeReplace(): AnyRef = new scala.runtime.ModuleSerializationProxy(classOf[Expr.type]) final case class UpcastToIterable[T >: Nothing <: Any, C >: Nothing <: Iterable[T]]() extends Expr() { override def hashCode(): Int = -1772009433 override def equals(x$0: Any): Boolean = (this eq x$0.$asInstanceOf[Object]) || (x$0 match { case x$0 @ _:Expr.UpcastToIterable[T, C] @unchecked => true case _ => false } ) override def toString(): String = scala.runtime.ScalaRunTime._toString(this) override def canEqual(that: Any): Boolean = that.isInstanceOf[Expr.UpcastToIterable[T, C] @unchecked] override def productArity: Int = 0 override def productPrefix: String = "UpcastToIterable" override def productElement(n: Int): Any = n match { case _ => throw new IndexOutOfBoundsException(n.toString()) } override def productElementName(n: Int): String = n match { case _ => throw new IndexOutOfBoundsException(n.toString()) } T C <: Iterable[T] def copy[T, C <: Iterable[T]](): Expr.UpcastToIterable[T, C] = new Expr.UpcastToIterable[T, C]() def ordinal: Int = 0 } final lazy module val UpcastToIterable: Expr.UpcastToIterable = new Expr.UpcastToIterable() final module class UpcastToIterable() extends AnyRef(), scala.deriving.Mirror.Product { this: Expr.UpcastToIterable.type => private def writeReplace(): AnyRef = new scala.runtime.ModuleSerializationProxy( classOf[Expr.UpcastToIterable.type]) def apply[T, C <: Iterable[T]](): Expr.UpcastToIterable[T, C] = new Expr.UpcastToIterable[T, C]() def unapply[T, C <: Iterable[T]](x$1: Expr.UpcastToIterable[T, C]): true = true override def toString: String = "UpcastToIterable" type MirroredMonoType = Expr.UpcastToIterable[? <: AnyKind, ? <: AnyKind] def fromProduct(x$0: Product): Expr.UpcastToIterable.MirroredMonoType = { new Expr.UpcastToIterable[Any, Iterable[Any]]() } } def fromOrdinal(ordinal: Int): Expr = throw new NoSuchElementException( "enum Expr has no case with ordinal: " + ordinal.toString()) { val x$proxy1: scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } = Expr.$asInstanceOf[ scala.deriving.Mirror.Sum{ type MirroredMonoType = Expr; type MirroredType = Expr; type MirroredLabel = ("Expr" : String); type MirroredElemTypes = Expr.UpcastToIterable[Any, Iterable[T]] *: EmptyTuple.type; type MirroredElemLabels = ("UpcastToIterable" : String) *: EmptyTuple.type } ] x$proxy1 } type MirroredMonoType = Expr def ordinal(x$0: Expr.MirroredMonoType): Int = x$0.ordinal } } of class class dotty.tools.dotc.ast.Trees$PackageDef unhandled exception while running pickler on expr_pickle_crash.scala An unhandled exception was thrown in the compiler. Please file a crash report here: https://github.com/scala/scala3/issues/new/choose For non-enriched exceptions, compile with -Xno-enrich-error-messages. while compiling: expr_pickle_crash.scala during phase: pickler mode: Mode(ImplicitsEnabled) library version: version 2.13.16 compiler version: version 3.7.2 settings: Exception in thread "main" java.lang.AssertionError: assertion failed: orphan parameter reference: TypeParamRef(T)	at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:318)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType$$anonfun$2(TreePickler.scala:204)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:204)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType$$anonfun$2(TreePickler.scala:204)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:204)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType$$anonfun$2(TreePickler.scala:204)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:204)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:279)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:271)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleNewType(TreePickler.scala:270)	at dotty.tools.dotc.core.tasty.TreePickler.pickleType(TreePickler.scala:183)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree(TreePickler.scala:716)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTpt(TreePickler.scala:352)	at dotty.tools.dotc.core.tasty.TreePickler.pickleDef(TreePickler.scala:382)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree(TreePickler.scala:647)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree$$anonfun$11(TreePickler.scala:619)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree(TreePickler.scala:617)	at dotty.tools.dotc.core.tasty.TreePickler.pickleStats$$anonfun$2(TreePickler.scala:423)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickleStats(TreePickler.scala:423)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree(TreePickler.scala:698)	at dotty.tools.dotc.core.tasty.TreePickler.pickleDef(TreePickler.scala:381)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree(TreePickler.scala:664)	at dotty.tools.dotc.core.tasty.TreePickler.pickleStats$$anonfun$2(TreePickler.scala:423)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickleStats(TreePickler.scala:423)	at dotty.tools.dotc.core.tasty.TreePickler.pickleTree(TreePickler.scala:714)	at dotty.tools.dotc.core.tasty.TreePickler.pickle$$anonfun$1(TreePickler.scala:946)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.tasty.TreePickler.pickle(TreePickler.scala:944)	at dotty.tools.dotc.transform.Pickler.run$$anonfun$1$$anonfun$1(Pickler.scala:306)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.transform.Pickler.run$$anonfun$1(Pickler.scala:279)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.transform.Pickler.run(Pickler.scala:278)	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:383)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.immutable.List.foreach(List.scala:334)	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:376)	at dotty.tools.dotc.transform.Pickler.runPhase$1(Pickler.scala:392)	at dotty.tools.dotc.transform.Pickler.runOn(Pickler.scala:398)	at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:368)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)	at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1324)	at dotty.tools.dotc.Run.runPhases$1(Run.scala:361)	at dotty.tools.dotc.Run.compileUnits$$anonfun$1$$anonfun$2(Run.scala:408)	at dotty.tools.dotc.Run.compileUnits$$anonfun$1$$anonfun$adapted$1(Run.scala:408)	at scala.Function0.apply$mcV$sp(Function0.scala:42)	at dotty.tools.dotc.Run.showProgress(Run.scala:470)	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:408)	at dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:420)	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:69)	at dotty.tools.dotc.Run.compileUnits(Run.scala:420)	at dotty.tools.dotc.Run.compileSources(Run.scala:307)	at dotty.tools.dotc.Run.compile(Run.scala:292)	at dotty.tools.dotc.Driver.doCompile(Driver.scala:37)	at dotty.tools.dotc.Driver.process(Driver.scala:201)	at dotty.tools.dotc.Driver.process(Driver.scala:169)	at dotty.tools.dotc.Driver.process(Driver.scala:181)	at dotty.tools.dotc.Driver.main(Driver.scala:211)	at dotty.tools.MainGenericCompiler$.run$1(MainGenericCompiler.scala:160)	at dotty.tools.MainGenericCompiler$.main(MainGenericCompiler.scala:184)	at dotty.tools.MainGenericCompiler.main(MainGenericCompiler.scala)	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)	at java.base/java.lang.reflect.Method.invoke(Method.java:580)	at coursier.bootstrap.launcher.a.a(Unknown Source)	at coursier.bootstrap.launcher.Launcher.main(Unknown Source)