title: How to find out what keyword has been used for local variable declaration?
body: <p>How do I find out what keyword has been used for declaring a local variable? how do I differentiate between the following:</p>
  
  <pre><code>var hi = "asdf";
  string hi = "asdf";
  </code></pre>
  
  <p>Also, is there a comprehensive API documentation available for writing Roslyn diagnostics? Has anyone written a book on this yet?</p>