title: Eclipse: syntax highlighting disappeared for one of my files
body: <p>I was trying to close unused files in Eclipse and accidentally made something wrong. Now I can't see syntax highlighting for one of my files.
  Here are two screenshots - on the first you can see file, where highlighting is broken, and on the second everything is fine:
  <img src="https://i.stack.imgur.com/Fi0mq.png" alt="enter image description here"><img src="https://i.stack.imgur.com/L4h2B.png" alt="enter image description here"></p>
  
  <p>Highlighting doesn't work for this file only. Extension of this file is correct. I tried to look through all menu buttons carefully, but this attempt failed, I suppose Eclipse is hard enough for newbie. Of course, I tried to find information in the Web, but couldn't get anything relative. </p>