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Reading http://www.scala-lang.org/api/2.11.1/index.html#scala.collection.TraversableOnce:

Directly subclassing TraversableOnce is not recommended - instead, consider declaring an Iterator with a next and hasNext method, creating an Iterator with one of the methods on the Iterator object, or declaring a subclass of Traversable.

Why is subclassing TraversableOnce not recommended?

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It's because you would have to implement 12 relatively complex abstract methods, whereas with the recommended alternatives, you get that functionality much more easily. TraversableOnce is there to provide a convenient abstract type for a function argument.

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