title: Code appears as comments in R?
body: <p>I know that:</p>
  
  <pre><code># this is a comment
  code &lt;- ("this is code")
  </code></pre>
  
  <p>Can anyone tell me how it is possible and for some R code to appear in green (like a comment)
  even though I have not stated a # in front of the code? The code can be run without any 
  trouble, that is the strange part?</p>
  
  <p>One of my students had that "problem", and I couldn't figure out why the code appeared green?</p>
  
  <p>Thanks in advance for an answer :)</p>
  
  <p>Kind Regards 
  Maria</p>