<blockquote>
<p>While we're thinking about extending the conditional macro syntax, here's another thing to consider:</p>
</blockquote>
<blockquote>
<p>The current ? test is only for (non-)existence of macro, which is extremely limiting. We could easily make the spec %if expression parser available to macro engine, which would give a whole new level of power to macros.</p>
</blockquote>
<p>Please, what it the expected be gain from it?</p>

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