<p>At quick investigation, it is actually a valid define, like:</p>

<pre><code>#!define NAME[SEPARATOR]VALUE
</code></pre>

<p>So:</p>

<pre><code>#!define X-Y
</code></pre>

<p>is like X is defined with the value '-Y'.</p>

<p>Anyhow, I added some rules in the grammar to try to catch this situation, one can add space after ID to separate more visible from the value.</p>

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