Typeable failing in 2.3.3 for code that works in 2.3.2

[m50d]

(Tested under scala 2.11)

The following code works as expected with shapeless 2.3.2

object X {
  case class A()
  case class B(a: A) {
    private[this] val aa = a
  }
}
object Test {
  shapeless.Typeable[X.B]
}

But when using shapeless 2.3.3 I get:

<console>:13: error: No default Typeable for parametrized type X.B
         shapeless.Typeable[X.B]
                           ^

[joroKr21]

This error message is very misleading. Weird how the comment explains something else entirely:

shapeless/core/src/main/scala/shapeless/typeable.scala

Lines 473 to 477 in e17b96e

	if (nonCaseAccessor) {
	// there is a symbol, which is not a case accessor but a val,
	// var or param, so we won't be able to type check it safely:
	c.abort(c.enclosingPosition, s"No default Typeable for parametrized type $tpe")
	}