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<h2 class="chapter">11 Implementation Details</h2>

<p>Here we document details of how the preprocessor&rsquo;s implementation
affects its user-visible behavior.  You should try to avoid undue
reliance on behavior described here, as it is possible that it will
change subtly in future implementations.
</p>
<p>Also documented here are obsolete features still supported by CPP.
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