Case classes extending Exception have incorrect toString()

[scabug]

scala> case class A(s: String) extends Exception
defined class A

scala> A("foo").toString
res4: java.lang.String = A

You would expect A(foo) to be printed. If you let A extend any other class (as far as I have tested), toString behaves correctly.

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-1549?orig=1
Reporter: @rickynils

[scabug]

@DRMacIver said:
No, this is a feature. Case classes are defined to only generate these methods if they've not been defined in a superclass which isn't AnyRef. java.lang.Throwable defines a toString method, so case classes which extend it don't. See 5.3.2 in the language spec.