title: nested CPS "reset"
body: <p>using the CPS compiler-plugin of Scala 2.8, there are the two magic controls <code>reset</code> and <code>shift</code>. Reset delimits the continuation and shift captures the continuation.</p>
  
  <p>There is an <a href="http://www.scala-lang.org/node/2096#comment-7674" rel="nofollow noreferrer">example</a> of using CPS with NIO, using nested resets as a type of "forking"...?
  I don't exactly understand the purpose of nesting the resets, what's the effect?</p>