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<title>The C Preprocessor: Implementation Details</title>
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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 and changes from previous
versions of CPP.
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