<span class="hljs-attribute">first_quote_symbol</span>  = <span class="hljs-string">"'"</span> .
<span class="hljs-attribute">second_quote_symbol</span> = <span class="hljs-string">'"'</span> .

<span class="hljs-comment">(* escaped_quote_symbol tests backticks, which does not interfere
 * with backslashes. It has precedent in some language
 * specifications.
 *)</span>
<span class="hljs-attribute">escaped_quote_symbol</span> = <span class="hljs-string">`\`</span> ( first_quote_symbol | second_quote_symbol ) .