    
            <div class="content"><div class='highlight'><pre>  check <span class="hljs-string">"ok: exclamation mark at the begging"</span>, <span class="hljs-function">-&gt;</span>

    nextToken = tokenizer (result = <span class="hljs-keyword">new</span> Result), expr =  <span class="hljs-string">'! a'</span>

    expect(nextToken()).toBe <span class="hljs-string">'!'</span>
    expect(nextToken()).toBe <span class="hljs-string">'a'</span>
    expect(nextToken()).toBe <span class="hljs-literal">n