Dotty does not handle correctly raw types in parent position coming from classfiles.

[smarter]

As reported in #3273 (comment):

tail /tmp/Test.java sandbox/client.scala ;  javac -d /tmp /tmp/Test.java && scalac -cp /tmp sandbox/client.scala && ./bin/dotc -classpath /tmp sandbox/client.scala
==> /tmp/Test.java <==
class Test {
	static abstract class A<X> extends B {
		abstract B foo();
	}
	static abstract class B<X> {
		abstract A bar();
	}
}

==> sandbox/client.scala <==
class Client {
  val a = (_: Test.A[AnyRef]).foo
  val b = (_: Test.B[AnyRef]).bar
  def test(x: Test.A[AnyRef]): Test.B[_] = x
}
-- [E007] Type Mismatch Error: sandbox/client.scala:4:43 -----------------------
4 |  def test(x: Test.A[AnyRef]): Test.B[_] = x
  |                                           ^
  |                                           found:    Test.A[AnyRef](x)
  |                                           required: Test.B[_]
  |

one error found

[odersky]

Fixed by #3317.