title: Need more clarity on Definition Expressions
body: <p>What does this statement mean and why would I write code like that?</p>
  
  <pre><code>let id x = x in (id 3, id "Three") 
  </code></pre>
  
  <blockquote>
    <p>F# 3.0 spec: 6.6 Definition Expressions</p>
  </blockquote>