title: What changes introduced in C++14 can potentially break a program written in C++11?
body: <p><strong>Introduction</strong></p>
  
  <p>With the <em>C++14</em> (aka. <em>C++1y</em>) Standard in a state close to being final, programmers must ask themselves about backwards compatibility, and issues related to such.</p>
  
  <hr>
  
  <p><strong>The question</strong></p>
  
  <p>In the answers of <a href="https://stackoverflow.com/q/23047198/1090079">this question</a> it is stated that the Standard has an <em>Appendix</em> dedicated to information regarding changes between revisions.</p>
  
  <p>It would be helpful if these potential issues in the previously mentioned <em>Appendix</em> could be explained, perhaps with the help of any formal documents related to what is mentioned there.</p>
  
  <ul>
  <li><em>According to the Standard</em>: What changes introduced in <em>C++14</em> can potentially break a program written in C++11?</li>
  </ul>