Scala type which can only be extended by an object, not by a non-abstract type ...
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| scala> class Foo { self: Singleton => } | |
| defined class Foo | |
| scala> class Bar extends Foo | |
| <console>:12: error: illegal inheritance; | |
| self-type Bar does not conform to Foo's selftype Foo with Singleton | |
| class Bar extends Foo | |
| ^ | |
| scala> object Bar extends Foo | |
| defined object Bar | |
| scala> |
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Seems like magic, since if you try to extend Singleton directly, you're chastised that Singleton is final! (Nor does it appear in the ScalaDoc!)