<span class="keywordsign">-&gt;</span>&nbsp;char<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;sub_lexeme_char_opt&nbsp;:&nbsp;<span class="constructor">Lexing</span>.lexbuf&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;char&nbsp;option<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;lex_tables&nbsp;=&nbsp;{<br>
&nbsp;&nbsp;&nbsp;&nbsp;lex_base&nbsp;:&nbsp;string;<br>
&nbsp;&nbsp;&nbsp;&nbsp;lex_backtrk&nbsp;:&nbsp;string;<br>
&nbsp;&nbs