lambda syntax tutorial (3. Defender Methods)

[Brian Goetz]

> To be consistent with Javadoc and Method References I would suggest:
>
> extension List<T>  map(Mapper<T>  r) default Collections#<T>listMapper;

Ah, but that would only expose another inconsistency, which would surely 
result in the following question: "why can I use a method reference but not a 
lambda expression?"

> IE use a # instead of a . so that it is clear that it is a literal
> reference to a method and not a method call (as well as the
> consistency reason already mentioned).