title: Syntax highlighting of Fortran 77 comments not working in vim
body: <p>I have a code written in Fortran 77 and I read it with vim. The code is written such that the comments are on lines starting with <code>c</code>, as is standard in Fortran 77. However, vim does not recognize them and therefore use a coloring syntax that makes the code very difficult to read! How can I overcome this? </p>
  
  <p>I've seen that there is a <a href="https://stackoverflow.com/questions/9505125/fortran-free-source-interrupts-comment-syntax-coloring-in-vim">post with the same problem</a>. I have read the answers and tried the different solutions that have been suggested:</p>
  
  <ol>
  <li><p>add <code>let fortran_have_tabs=1</code> to .vimrc</p></li>
  <li><p>add </p>
  
  <pre><code>syn match fortranComment excludenl "^[!c*].*$" contains=@fortranCommentGroup,@spell
  syn match fortranComment excludenl "!.*$" contains=@fortranCommentGroup,@spell
  </code></pre>
  
  <p>to .vimrc</p></li>
  </ol>
  
  <p>but they do not work for me. Does someone know why? Have I made a mistake somewhere? Otherwise, does anyone have a different suggestion?</p>