d to lex::lexer, while the original
            class lex::lexer does not exist anymore. This simplifies the creation
            of lexers.
          </li>
<li class="listitem">
            The lex::lexer class does not have the function <code class="computeroutput"><span class="identifier">def</span><span class="special">(</span><span class="identifier">Self</span><span class="special">&amp;</span> <span class="identifier">self</span><span class="special">)</span></code> anymore, token definitions can be 