Lambda's/Closures & Extension Methods in JDK 1.6

[Brian Goetz]

> I've implemented 2 features to the JDK 6 without any changes to the JDK,
> JavaC, Java Syntax, or Java Byte code. As such, I think they might be of
> interest to Project Coin.
>
> Those 2 features are:
> Lambdas
> Extension Methods

We considered, and explicitly rejected, implementing extension methods with a 
compiler-only strategy because it can cause all sorts of "brittle class" 
problems.