VerifyError with implicit ClassTag in companion object

[hughsimpson]

The following throws a VerifyError (Tested with 3.0.0-M3)

import scala.reflect.ClassTag

@main def run = println(Foo)

abstract class Bar[T](implicit val thisClassTag: ClassTag[T])

class Foo
object Foo extends Bar[Foo]

Alternatives tried:

• Changing abstract class Bar[T](implicit val thisClassTag: ClassTag[T]) to abstract class Bar[T: ClassTag]{ val thisClassTag: ClassTag[T] = implicitly[ClassTag[T]] } works
• Changing object Foo extends Bar[Foo] to object Foo extends Bar()(classTag[Foo]) works
• Summoning an implicit of a different class works (only ClassTag specifically seems to be affected)
• Using the ClassTag of anything other than the companion class works (object Foo extends Bar[Foo2] seems fine)

[griggt]

This example, reported as scala/bug#473, also throws a VerifyError at runtime with 3.0.0-M3 whereas in Scala 2 it is a compile error.

class Foo(implicit val foo: Foo)

object Test extends App {
  implicit object Bar extends Foo
  Bar.foo
}