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Next: <a href="The-package_002dinferred_002dsystem-extension.html#The-package_002dinferred_002dsystem-extension" accesskey="n" rel="next">The package-inferred-system extension</a>, Previous: <a href="The-defsystem-grammar.html#The-defsystem-grammar" accesskey="p" rel="prev">The defsystem grammar</a>, Up: <a href="Defining-systems-with-defsystem.html#Defining-systems-with-defsystem" accesskey="u" rel="up">Defining systems with defsystem</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<h3 class="section">6.4 Other code in .asd files</h3>
<p>Files containing <code>defsystem</code> forms
are regular Lisp files that are executed by <code>load</code>.
Consequently, you can put whatever Lisp code you like into these files.
However, it is recommended to keep such forms to a minimal,
and to instead define <code>defsystem</code> extensions
that you use with <code>:defsystem-depends-on</code>.
</p>
<p>If however, you might insist on including code in the <samp>.asd</samp> file itself,
e.g., to examine and adjust the compile-time environment,
possibly adding appropriate features to <code>*features*</code>.
If so, here are some conventions we recommend you follow,
so that users can control certain details of execution
of the Lisp in <samp>.asd</samp> files:
</p>
<ul>
<li> Any informative output
(other than warnings and errors,
which are the condition system’s to dispose of)
should be sent to the standard CL stream <code>*standard-output*</code>,
so that users can easily control the disposition
of output from ASDF operations.
</li></ul>
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